Category: stars

What’s Up For August 2018?

The summer Perseids are here! 

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The Perseid meteor shower is the best of the year! It peaks on a Moonless summer night from 4 p.m. EST on August 12 until 4 a.m. EST on August 13.

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Because the new Moon falls near the peak night, the days before and after the peak will also provide nice, dark skies. Your best window of observation is from a few hours after twilight until dawn, on the days surrounding the peak.

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Unlike most meteor showers, which have a short peak of high meteor rates, the Perseids have a very broad peak, as Earth takes more than three weeks to plow through the wide trail of cometary dust from comet Swift-Tuttle.

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The Perseids appear to radiate from the constellation Perseus, visible in the northern sky soon after sunset this time of year. Observers in mid-northern latitudes will have the best views.

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You should be able to see some meteors from July 17 to August 24, with the rates increasing during the weeks before August 12 and decreasing after August 13.

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Observers should be able to see between 60 and 70 per hour at the peak. Remember, you don’t have to look directly at the constellation to see them. You can look anywhere you want to-even directly overhead.

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Meteor showers like the Perseids are caused by streams of meteoroids hitting Earth’s atmosphere. The particles were once part of their parent comet-or, in some cases, from an asteroid.

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The parade of planets Venus, Jupiter, Saturn and Mars–and the Milky Way continue to grace the evening sky, keeping you and the mosquitoes company while you hunt for meteors.

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Watch the full What’s Up for August Video: 

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Happy 4th of July… From Space!

In Hollywood blockbusters, explosions and eruptions are often among the stars of the show. In space, explosions, eruptions and twinkling of actual stars are a focus for scientists who hope to better understand their births, lives, deaths and how they interact with their surroundings. Spend some of your Fourth of July taking a look at these celestial phenomenon:

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Credit: NASA/Chandra X-ray Observatory

An Astral Exhibition

This object became a sensation in the astronomical community when a team of researchers pointed at it with our Chandra X-ray Observatory telescope in 1901, noting that it suddenly appeared as one of the brightest stars in the sky for a few days, before gradually fading away in brightness. Today, astronomers cite it as an example of a “classical nova,” an outburst produced by a thermonuclear explosion on the surface of a white dwarf star, the dense remnant of a Sun-like star.

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Credit: NASA/Hubble Space Telescope

A Twinkling Tapestry

The brilliant tapestry of young stars flaring to life resemble a glittering fireworks display. The sparkling centerpiece is a giant cluster of about 3,000 stars called Westerlund 2, named for Swedish astronomer Bengt Westerlund who discovered the grouping in the 1960s. The cluster resides in a raucous stellar breeding ground located 20,000 light-years away from Earth in the constellation Carina.

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Credit: NASA/THEMIS/Sebastian Saarloos

An Illuminating Aurora

Sometimes during solar magnetic events, solar explosions hurl clouds of magnetized particles into space. Traveling more than a million miles per hour, these coronal mass ejections, or CMEs, made up of hot material called plasma take up to three days to reach Earth. Spacecraft and satellites in the path of CMEs can experience glitches as these plasma clouds pass by. In near-Earth space, magnetic reconnection incites explosions of energy driving charged solar particles to collide with atoms in Earth’s upper atmosphere. We see these collisions near Earth’s polar regions as the aurora. Three spacecraft from our Time History of Events and Macroscale Interactions during Substorms (THEMIS) mission, observed these outbursts known as substorms.

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Credit: NASA/Hubble Space Telescope//ESA/STScI

A Shining Supermassive Merger

Every galaxy has a black hole at its center. Usually they are quiet, without gas accretions, like the one in our Milky Way. But if a star creeps too close to the black hole, the gravitational tides can rip away the star’s gaseous matter. Like water spinning around a drain, the gas swirls into a disk around the black hole at such speeds that it heats to millions of degrees. As an inner ring of gas spins into the black hole, gas particles shoot outward from the black hole’s polar regions. Like bullets shot from a rifle, they zoom through the jets at velocities close to the speed of light. Astronomers using our Hubble Space Telescope observed correlations between supermassive black holes and an event similar to tidal disruption, pictured above in the Centaurus A galaxy. 

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Credit: NASA/Hubble Space Telescope/ESA

A Stellar Explosion

Supernovae can occur one of two ways. The first occurs when a white dwarf—the remains of a dead star—passes so close to a living star that its matter leaks into the white dwarf. This causes a catastrophic explosion. However most people understand supernovae as the death of a massive star. When the star runs out of fuel toward the end of its life, the gravity at its heart sucks the surrounding mass into its center. At the turn of the 19th century, the binary star system Eta Carinae was faint and undistinguished. Our Hubble Telescope captured this image of Eta Carinae, binary star system. The larger of the two stars in the Eta Carinae system is a huge and unstable star that is nearing the end of its life, and the event that the 19th century astronomers observed was a stellar near-death experience. Scientists call these outbursts supernova impostor events, because they appear similar to supernovae but stop just short of destroying their star.

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Credit: NASA/GSFC/SDO

An Eye-Catching Eruption

Extremely energetic objects permeate the universe. But close to home, the Sun produces its own dazzling lightshow, producing the largest explosions in our solar system and driving powerful solar storms.. When solar activity contorts and realigns the Sun’s magnetic fields, vast amounts of energy can be driven into space. This phenomenon can create a sudden flash of light—a solar flare.The above picture features a filament eruption on the Sun, accompanied by solar flares captured by our Solar Dynamics Observatory.

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What’s Up – July 2018

What’s Up for July?

Mars is closest to Earth since 2003!

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July’s night skies feature Mars opposition on the 27th, when Mars, Earth, and the Sun all line up, and Mars’ closest approach to Earth since 2003 on the 31st. 

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If you’ve been sky watching for 15 years or more, then you’ll remember August 2003, when Mars approached closer to Earth than it had for thousands of years.

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It was a very small percentage closer, but not so much that it was as big as the moon as some claimed.   

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Astronomy clubs everywhere had long lines of people looking through their telescopes at the red planet, and they will again this month!

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 If you are new to stargazing, this month and next will be a great time to check out Mars. 

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Through a telescope, you should be able to make out some of the light and dark features, and sometimes polar ice. Right now, though, a huge Martian dust storm is obscuring many features, and less planetary detail is visible.

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July 27th is Mars opposition, when Mars, Earth, and the Sun all line up, with Earth directly in the middle.

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A few days later on July 31st is Mars’ closest approach. That’s when Mars and Earth are nearest to each other in their orbits around the Sun. Although there will be a lot of news focusing on one or the other of these two dates, Mars will be visible for many months.

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By the end of July, Mars will be visible at sunset.

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But the best time to view it is several hours after sunset, when Mars will appear higher in the sky.

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Mars will still be visible after July and August, but each month it will shrink in apparent size as it travels farther from Earth in its orbit around the Sun.

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On July 27th a total lunar eclipse will be visible in Australia, Asia, Africa, Europe and South America.

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For those viewers, Mars will be right next to the eclipsing moon!

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Next month will feature August’s summer Perseids. It’s not too soon to plan a dark sky getaway for the most popular meteor shower of the year! 

Watch the full What’s Up for July Video:

There are so many
sights to see in the sky. To stay informed, subscribe to our What’s Up video
series on Facebook
.

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Navigating Space by the Stars

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A sextant is a tool for measuring the angular altitude of a star above the horizon and has helped guide sailors across oceans for centuries. It is now being tested aboard the International Space Station as a potential emergency navigation tool for guiding future spacecraft across the cosmos. The Sextant Navigation investigation will test the use of a hand-held sextant that utilizes star sighting in microgravity. 

Read more about how we’re testing this tool in space!  

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Where in the World is Our Flying Telescope? Ne…

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Our flying observatory SOFIA carries a telescope inside this Boeing 747SP aircraft. Scientists use SOFIA to study the universe — including stars, planets and black holes — while flying as high as 45,000 feet.

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SOFIA is typically based at our Armstrong Flight Research Center in Palmdale, California, but recently arrived in Christchurch, New Zealand, to study celestial objects that are best observed from the Southern Hemisphere.

So what will we study from the land down under?

Eta Carinae

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Eta Carinae, in the southern constellation Carina, is the most luminous stellar system within 10,000 light-years of Earth. It’s made of two massive stars that are shrouded in dust and gas from its previous eruptions and may one day explode as a supernova. We will analyze the dust and gas around it to learn how this violent system evolves.

Celestial Magnetic Fields

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We can study magnetic fields in the center of our Milky Way galaxy from New Zealand because there the galaxy is high in the sky — where we can observe it for long periods of time. We know that this area has strong magnetic fields that affect the material spiraling into the black hole here and forming new stars. But we want to learn about their shape and strength to understand how magnetic fields affect the processes in our galactic center.

Saturn’s Moon Titan

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Titan is Saturn’s largest moon and is the only moon in our solar system to have a thick atmosphere — it’s filled with a smog-like haze. It also has seasons, each lasting about seven Earth years. We want to learn if its atmosphere changes seasonally.

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Titan will pass in front of a star in an eclipse-like event called an occultation. We’ll chase down the shadow it casts on Earth’s surface, and fly our airborne telescope directly in its center. 

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From there, we can determine the temperature, pressure and density of Titan’s atmosphere. Now that our Cassini Spacecraft has ended its mission, the only way we can continue to monitor its atmosphere is by studying these occultation events.

Nearby Galaxies

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The Large Magellanic Cloud is a galaxy near our own, but it’s only visible from the Southern Hemisphere! Inside of it are areas filled with newly forming stars and the leftovers from a supernova explosion.

The Tarantula Nebula

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The Tarantula Nebula, also called 30 Doradus, is located in the Large Magellanic Cloud and shown here in this image from Chandra, Hubble and Spitzer. It holds a cluster of thousands of stars forming simultaneously. Once the stars are born, their light and winds push out the material leftover from their parent clouds — potentially leaving nothing behind to create more new stars. We want to know if the material is still expanding and forming new stars, or if the star-formation process has stopped. So our team on SOFIA will make a map showing the speed and direction of the gas in the nebula to determine what’s happening inside it.

Supernova 1987A

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Also in the Large Magellanic Cloud is Supernova 1987A, the closest supernova explosion witnessed in almost 400 years. We will continue studying this supernova to better understand the material expanding out from it, which may become the building blocks of future stars and planets. Many of our telescopes have studied Supernova 1987A, including the Hubble Space Telescope and the Chandra X-ray Observatory, but our instruments on SOFIA are the only tools we can use to study the debris around it with infrared light, which let us better understand characteristics of the dust that cannot be measured using other wavelengths of light.

For live updates about our New Zealand observations follow SOFIA on Facebook, Twitter and Instagram.

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What’s Up – June 2018

What’s Up For June?

Jupiter and Venus at sunset, Mars, Saturn and Vesta until dawn.

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First up is Venus. It reaches its highest sunset altitude for the year this month and sets more than two hours after sunset.

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You can’t miss Jupiter, only a month after its opposition–when Earth was directly between Jupiter and the Sun.

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The best time to observe Jupiter through a telescope is 10:30 p.m. at the beginning of the month and as soon as it’s dark by the end of the month.  

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Just aim your binoculars at the bright planet for a view including the four Galilean moons. Or just enjoy Jupiter with your unaided eye!

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Saturn is at opposition June 27th, when it and the Sun are on opposite sides of Earth. It rises at sunset and sets at sunrise. Great Saturn viewing will last several more months. The best views this month will be just after midnight.

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All year, the rings have been tilted wide open–almost 26 degrees wide this month–giving us a great view of Saturn’s distinctive rings.

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The tilt offers us a view of the north polar region, so exquisitely imaged by the Cassini spacecraft.

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Near Saturn, the brightest asteroid–Vesta–is so bright that it can be seen with your unaided eye. It will be visible for several months.

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A detailed star chart will help you pick out the asteroid from the stars. The summer Milky way provides a glittery backdrop.

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Finally, Mars grows dramatically in brightness and size this month and is visible by 10:30 p.m. by month end.

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The best views are in the early morning hours. Earth’s closest approach with Mars is only a month away. It’s the closest Mars has been to us since 2003.

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Watch the full What’s Up for June Video: 

There are so many sights to see in the sky. To stay informed, subscribe to our What’s Up video series on Facebook.

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What’s Up? – May 2018

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What’s Up For May?

The Moon and Saturn meet Mars in the morning as our InSight spacecraft launches to the Red Planet on May 5!

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You won’t want to miss red Mars in the southern morning skies this month.

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InSight, our first mission to explore Mars’ deep interior, launches on May 5th with a launch window that begins at 4:05 a.m. PDT and lasts for two hours.

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Some lucky viewers in central and southern California and even parts of the Mexican Pacific coast will get a chance to see the spacecraft launch with their unaided eyes AND its destination, Mars, at the same time.

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Mars shines a little brighter than last month, as it approaches opposition on July 27th. That’s when Mars and the Sun will be on opposite sides of the Earth. This will be Mars’ closest approach to Earth since 2003! 

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Compare the planet’s increases in brightness with your own eyes between now and July 27th. 

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The Eta Aquarid meteor shower will be washed out by the Moon this month, but if you are awake for the InSight launch anyway, have a look. This shower is better viewed from the southern hemisphere, but medium rates of 10 to 30 meteors per hour MAY be seen before dawn.

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Of course, you could travel to the South Pacific to see the shower at its best!

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There’s no sharp peak to this shower–just several nights with good rates, centered on May 6th. 

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Jupiter reaches opposition on May 9th, heralding the best Jupiter-observing season, especially for mid-evening viewing. That’s because the king of the planets rises at sunset and sets at dawn. 

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Wait a few hours after sunset, when Jupiter is higher in the sky, for the best views. If you viewed Jupiter last month, expect the view to be even better this month!

Watch the full What’s Up for May Video: 

There are so many sights to see in the sky. To stay informed, subscribe to our What’s Up video series on Facebook.

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Ten Observations From Our Flying Telescope

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SOFIA is a Boeing 747SP aircraft with a 100-inch telescope used to study the solar system and beyond by observing infrared light that can’t reach Earth’s surface.

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What is infrared light? It’s light we cannot see with our eyes that is just beyond the red portion of visible light we see in a rainbow. It can be used to change your TV channels, which is how remote controls work, and it can tell us how hot things are.

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Everything emits infrared radiation, even really cold objects like ice and newly forming stars! We use infrared light to study the life cycle of stars, the area around black holes, and to analyze the chemical fingerprints of complex molecules in space and in the atmospheres of other planets – including Pluto and Mars.

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Above, is the highest-resolution image of the ring of dust and clouds around the back hole at the center of our Milky Way Galaxy. The bright Y-shaped feature is believed to be material falling from the ring into the black hole – which is located where the arms of the Y intersect.

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The magnetic field in the galaxy M82 (pictured above) aligns with the dramatic flow of material driven by a burst of star formation. This is helping us learn how star formation shapes magnetic fields of an entire galaxy.

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A nearby planetary system around the star Epsilon Eridani, the location of the fictional Babylon 5 space station, is similar to our own: it’s the closest known planetary system around a star like our sun and it also has an asteroid belt adjacent to the orbit of its largest, Jupiter-sized planet.

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Observations of a supernova that exploded 10,000 years ago, that revealed it contains enough dust to make 7,000 Earth-sized planets!

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Measurements of Pluto’s upper atmosphere, made just two weeks before our New Horizons spacecraft’s Pluto flyby. Combining these observations with those from the spacecraft are helping us understand the dwarf planet’s atmosphere.

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A gluttonous star that has eaten the equivalent of 18 Jupiters in the last 80 years, which may change the theory of how stars and planets form.

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Molecules like those in your burnt breakfast toast may offer clues to the building blocks of life. Scientists hypothesize that the growth of complex organic molecules like these is one of the steps leading to the emergence of life.

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This map of carbon molecules in Orion’s Horsehead nebula (overlaid on an image of the nebula from the Palomar Sky Survey) is helping us understand how the earliest generations of stars formed. Our instruments on SOFIA use 14 detectors simultaneously, letting us make this map faster than ever before!

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Pinpointing the location of water vapor in a newly forming star with groundbreaking precision. This is expanding our understanding of the distribution of water in the universe and its eventual incorporation into planets. The water vapor data from SOFIA is shown above laid over an image from the Gemini Observatory.

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We captured the chemical fingerprints that revealed celestial clouds collapsing to form young stars like our sun. It’s very rare to directly observe this collapse in motion because it happens so quickly. One of the places where the collapse was observed is shown in this image from The Two Micron All Sky Survey.

Learn more by following SOFIA on Facebook, Twitter and Instagram.

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The Geminids Are Now Playing in a Sky Near You

The Geminids, which peak during mid-December each year, are considered to be one of the best and most reliable annual meteor showers

This month, they’re active from Dec. 4-17, and peak the evening of Dec. 13-14 for a full 24 hours, meaning more worldwide meteor watchers will get to enjoy the show. 

Below are 10 things to know about this beautiful spectacle.

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1. The forecast. 

From our resident night sky expert, Jane Jones: If you can see Orion and Gemini in the sky, you’ll see some Geminids. Expect to see about 60 meteors per hour before midnight on Dec. 13 and from midnight-3:30 a.m. on Dec. 14 from a dark sky. You’ll see fewer meteors after moonrise at 3:30 a.m. local time. In the southern hemisphere, you won’t see as many, perhaps 10-20 per hour, because the radiant—the point in the sky where the meteor shower appears to originate—never rises above the horizon.

2. Viewing tips.

Kids can join in on the fun as early as 9 or 10 p.m. You’ll want to find an area well away from city or street lights. Come prepared for winter temperatures with a sleeping bag, blanket, or lawn chair. Lie flat on your back and look up, taking in as much of the sky as possible. After about 30 minutes in the dark, your eyes will adapt and you’ll begin to see meteors. Be patient—the show will last until dawn, so you have plenty of time to catch a glimpse.

3. Late bloomer.

The Geminids weren’t always such as a spectacular show. When they first began appearing in the mid-1800s, there were only 10-20 visible meteors per hour. Since then, the Geminids have grown to become one of the major showers of the year.

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4. Remind me—where do meteor showers come from?

Meteors come from leftover comet particles and bits from asteroids. When these objects come around the Sun, they leave a dusty trail behind them. Every year, the Earth passes through these debris trails, which allows the bits to collide with our atmosphere, where they disintegrate to create fiery and colorful streaks in the sky.

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5. That said…

While most meteor showers come from comets, the Geminids originate from an asteroid: 3200 Phaethon. Asteroid 3200 Phaethon takes 1.4 years to orbit the Sun once. It is possible that Phaethon is a “dead comet” or a new kind of object being discussed by astronomers called a “rock comet.” Phaethon’s comet-like, highly-elliptical orbit around the Sun supports this hypothesis. That said, scientists aren’t too sure how to define Phaethon. When it passes by the Sun, it doesn’t develop a cometary tail, and its spectra looks like a rocky asteroid. Also, the bits and pieces that break off to form the Geminid meteoroids are several times denser than cometary dust flakes.

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6. Tell me more. 

3200 Phaethon was discovered on Oct. 11, 1983 by the Infrared Astronomical Satellite. Because of its close approach to the Sun, Phaethon is named after the Greek mythological character who drove the Sun-god Helios’ chariot. Phaethon is a small asteroid: its diameter measures only 3.17 miles (5.10 kilometers) across. And we have astronomer Fred Whipple to thank—he realized that Phaethon is the source for the Geminids.

7. A tale of twins. 

The Geminids’ radiant is the constellation Gemini, a.k.a. the “Twins.” And, of course, the constellation of Gemini is also where we get the name for the shower: Geminids.

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8. In case you didn’t know. 

The constellation for which a meteor shower is named only helps stargazers determine which shower they’re viewing on a given night; the constellation is not the source of the meteors. Also, don’t just look to the constellation of Gemini to view the Geminids—they’re visible throughout the night sky.

9. And in case you miss the show. 

There’s a second meteor shower in December: the Ursids, radiating from Ursa Minor, the Little Dipper. If Dec. 22 and the morning of Dec. 23 are clear where you are, have a look at the Little Dipper’s bowl—you might see about 10 meteors per hour.

10. Endless opportunities. There are so many sights to see in the sky. Use the Night Sky Network, the Solar System Ambassadors, and the Museum Alliance to look up local astronomy clubs, and join them for stargazing events in town, and under dark skies.

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What’s Up November 2017

What’s Up For November?

Dawn pairing of Jupiter and Venus, Moon shines near star clusters, meteor activity all month long!

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This month binoculars will come in handy–to view the moon, star clusters, and a close pairing of Venus and Jupiter.

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You can’t miss bright Venus in the predawn sky. This month Venus pairs up
with Jupiter on the morning of November 13th.

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The Leonids peak on a moonless November 17th. Expect no more than 10 meteors an hour around 3:00 a.m., the height of the shower.

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The Northern and Southern sub-branches of the Taurid meteor shower offer sparse counts of about 5 meteors per hour, but slow, bright meteors are common.

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The nearby November Orionids peak on the 28th. In contrast to the Taurids, the Orionids are swift. But don’t expect more than 3 meteors per hour.

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The moon glides by three beautiful star clusters in the morning sky this month, and a pair of binoculars will allow you to see the individual stars in the clusters. Aim your binoculars at the Pleiades and the moon on the 5th.

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Then aim at the Messier or M-35 cluster and the moon on the 7th and the Beehive cluster and the moon on the 10th.

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Meanwhile, at dusk, catch Saturn as it dips closer to the western horizon and pairs up with Mercury on the 24th through the 28th.

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Also, Comet C/2017 O1 should still be a binocular-friendly magnitude 7 or 8 greenish object in November. Use Polaris, the North Star as a guide. Look in the East to Northeast sky in the late evening.  

Watch the full What’s Up for November Video: 

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