Solar System: 5 Things To Know This Week

Behold—the space station of the future! (…from 1973)

This artist’s concept gives a cutaway view of the Skylab orbital workshop, which launched 50 years ago on May 14, 1973. Established in 1970, the Skylab Program's goals were to enrich our scientific knowledge of Earth, the sun, the stars, and cosmic space; to study the effects of weightlessness on living organisms; to study the effects of the processing and manufacturing of materials in the absence of gravity; and to conduct Earth-resource observations.

Three crews visited Skylab and carried out 270 scientific and technical investigations in the fields of physics, astronomy, and biological sciences. They also proved that humans could live and work in outer space for extended periods of time, laying the groundwork for the International Space Station.

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Not all galaxies are lonely. Some have galaxy squads. ⁣

NGC 1706, captured in this image by our Hubble Space Telescope, belongs to something known as a galaxy group, which is just as the name suggests — a group of up to 50 galaxies which are gravitationally bound and relatively close to each other. ⁣

Our home galaxy, the Milky Way, has its own squad — known as the Local Group, which also contains the Andromeda galaxy, the Large and Small Magellanic clouds and the Triangulum galaxy.

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Solar System: Things to Know This Week

Our solar system is huge, so let us break it down for you. Here are five things you need to know this week:

1. The Lure of the Rings

Scientists and stargazers alike can’t resist the call of Saturn’s rings, or of its moon Titan. Both have been under close scrutiny by the Cassini spacecraft lately, and there are striking new pictures to prove it. Check out the latest images HERE.

2. A New Moon Rises

The Lunar Reconnaissance Orbiter has captured dramatic landscapes on the moon for more than six years. “A New Moon Rises,” now on display at the Smithsonian National Air and Space Museum in Washington, DC, showcases those images ranging from Apollo landing sites to mountains that rise out of the darkness of the lunar poles. See an online version of the exhibit HERE.  

3. Around the (Giant) World in (Just Under) 88 Days

The Juno mission is closing in on Jupiter. On July 4, the spacecraft enters orbit around the king of planets. Learn more about Juno HERE.

4. Spiders and Volcanoes and Glaciers, Oh My

The more data that New Horizons spacecraft sends down about Pluto and its moons, the more there is to fascinate explorers, from spider-shaped canyons to signs of glacial flow. Take a peek at the new finds on Pluto HERE.

5. World of Wonders

Hexagonal craters, mysterious mountains, eye-catching bright patches — the dwarf planet Ceres is proving to be an intriguing place. The Dawn mission is looking for clues to how it works. See the latest from Ceres HERE.

Want to learn more? Read our full list of the 10 things to know this week about the solar system HERE.

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10 Steps to Confirm a Planet Around Another Star

So you think you found an exoplanet -- a planet around another star? It’s not as simple as pointing a telescope to the sky and looking for a planet that waves back. Scientists gather many observations and carefully analyze their data before they can be even somewhat sure that they’ve discovered new worlds.

Here are 10 things to know about finding and confirming exoplanets.

This is an illustration of the different elements in our exoplanet program, including ground-based observatories, like the W. M. Keck Observatory, and space-based observatories like Hubble, Spitzer, Kepler, TESS, James Webb Space Telescope, WFIRST and future missions.

1. Pick your tool to take a look.

The vast majority of planets around other stars have been found through the transit method so far. This technique involves monitoring the amount of light that a star gives off over time, and looking for dips in brightness that may indicate an orbiting planet passing in front of the star.

We have two specialized exoplanet-hunting telescopes scanning the sky for new planets right now -- Kepler and the Transiting Exoplanet Survey Satellite (TESS) -- and they both work this way. Other methods of finding exoplanets include radial velocity (looking for a “wobble” in a star's position caused by a planet’s gravity), direct imaging (blocking the light of the star to see the planet) and microlensing (watching for events where a star passes in front of another star, and the gravity of the first star acts as a lens).

Here’s more about finding exoplanets.

2. Get the data.

To find a planet, scientists need to get data from telescopes, whether those telescopes are in space or on the ground. But telescopes don’t capture photos of planets with nametags. Instead, telescopes designed for the transit method show us how brightly thousands of stars are shining over time. TESS, which launched in April and just began collecting science data, beams its stellar observations back to Earth through our Deep Space Network, and then scientists get to work.

3. Scan the data for planets.

Researchers combing through TESS data are looking for those transit events that could indicate planets around other stars. If the star’s light lessens by the same amount on a regular basis -- for example, every 10 days -- this may indicate a planet with an orbital period (or “year”) of 10 days. The standard requirement for planet candidates from TESS is at least two transits -- that is, two equal dips in brightness from the same star.

4. Make sure the planet signature couldn’t be something else.

Not all dips in a star's brightness are caused by transiting planets. There may be another object -- such as a companion star, a group of asteroids, a cloud of dust or a failed star called a brown dwarf, that makes a regular trip around the target star. There could also be something funky going on with the telescope’s behavior, how it delivered the data, or other “artifacts” in data that just aren’t planets. Scientists must rule out all non-planet options to the best of their ability before moving forward.

5. Follow up with a second detection method.

Finding the same planet candidate using two different techniques is a strong sign that the planet exists, and is the standard for “confirming” a planet. That’s why a vast network of ground-based telescopes will be looking for the same planet candidates that TESS discovers. It is also possible that TESS will spot a planet candidate already detected by another telescope in the past. With these combined observations, the planet could then be confirmed. The first planet TESS discovered, Pi Mensae c, orbits a star previously observed with the radial-velocity method on the ground. Scientists compared the TESS data and the radial-velocity data from that star to confirm the presence of planet “c.”

Scientists using the radial-velocity detection method see a star’s wobble caused by a planet’s gravity, and can rule out other kinds of objects such as companion stars. Radial-velocity detection also allows scientists to calculate the mass of the planet.

6. …or at least another telescope.

Other space telescopes may also be used to help confirm exoplanets, characterize them and even discover additional planets around the same stars. If the planet is detected by the same method, but by two different telescopes, and has received enough scrutiny that the scientists are more than 99 percent sure it’s a planet, it is said to be “validated” instead of “confirmed.”

7. Write a paper.

After thoroughly analyzing the data, and running tests to make sure that their result still looks like the signature of a planet, scientists write a formal paper describing their findings. Using the transit method, they can also report the size of the planet. The planet’s radius is related to how much light it blocks from the star, as well as the size of the star itself. The scientists then submit the study to a journal.

8. Wait for peer review.

Scientific journals have a rigorous peer review process. This means scientific experts not involved in the study review it and make sure the findings look sound. The peer-reviewers may have questions or suggestions for the scientists. When everyone agrees on a version of the study, it gets published.

9. Publish the study.

When the study is published, scientists can officially say they have found a new planet. This may still not be the end of the story, however. For example, the TRAPPIST telescope in Chile first thought they had discovered three Earth-size planets in the TRAPPIST-1 system. When our Spitzer Space Telescope and other ground-based telescopes followed up, they found that one of the original reported planets (the original TRAPPIST-1d) did not exist, but they discovered five others --bringing the total up to seven wondrous rocky worlds.

10. Catalog and celebrate -- and look closer if you can!

Confirmed planets get added to our official catalog. So far, Kepler has sent back the biggest bounty of confirmed exoplanets of any telescope -- more than 2,600 to date. TESS, which just began its planet search, is expected to discover many thousands more. Ground-based follow-up will help determine if these planets are gaseous or rocky, and possibly more about their atmospheres. The forthcoming James Webb Space Telescope will be able to take a deeper look at the atmospheres of the most interesting TESS discoveries.

Scientists sometimes even uncover planets with the help of people like you: exoplanet K2-138 was discovered through citizen scientists in Kepler’s K2 mission data. Based on surveys so far, scientists calculate that almost every star in the Milky Way should have at least one planet. That makes billions more, waiting to be found! Stay up to date with our latest discoveries using this exoplanet counter.

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Chart-Topping Space Images From 2019 You Won’t Want to Miss

From the first-ever image of a black hole, to astronaut Christina Koch breaking the record for the longest single spaceflight by a woman – 2019 was full of awe-inspiring events! 

As we look forward to a new decade, we’ve taken ten of our top Instagram posts and put them here for your viewing pleasure. With eight out of ten being carousels, be sure to click on each title to navigate to the full post. 

1. First-Ever Black Hole Image Makes History 

In a historic feat by the Event horizon Telescope and National Science Foundation, an image of a black hole and its shadow was captured for the first time. At a whopping 3.4 million likes, this image takes home the gold as our most loved photo of 2019. Several of our missions were part of a large effort to observe this black hole using different wavelengths of light and collect data to understand its environment. Here’s a look at our Chandra X-Ray Observatory’s close-up of the core of the M87 galaxy with the imaged black hole at its center.  

2. Hubble Celebrates 29 Years of Dazzling Discoveries

When you wish upon a star… Hubble captures it from afar ✨On April 18, 2019 our Hubble Space Telescope celebrated 29 years of dazzling discoveries, serving as a window to the wonders of worlds light-years away. ⁣

Hubble continues to observe the universe in near-ultraviolet, visible, and near-infrared light. Over the past 29 years, it has captured the farthest views ever taken of the evolving universe, found planet-forming disks around nearby stars and identified the first supermassive black hole in the heart of a neighboring galaxy. ⁣Want more? Enjoy the full 10 photo Instagram carousel here. 

3. Stars and Stripes in Space for Flag Day 

Patriotism was in the air June 14 for Flag Day, and coming in at number three in our most liked Instagram line up is a carousel of our stars and stripes in space! One of the most iconic images from the Apollo 11 missions is of Buzz Aldrin saluting the American flag on the surface of the Moon. But did you know that over the years, five more flags joined the one left by Apollo 11 – and that many other flags have flown onboard our spacecraft? Scroll through the full carousel for flag day here. 

4. Spitzer Celebrates its Super Sweet 16! 

Since 2003, our Spitzer Space Telescope has been lifting the veil on the wonders of the cosmos, from our own solar system to faraway galaxies, using infrared light! Thanks to Spitzer, we've confirm the presence of seven rocky, Earth-size planets, received weather maps of hot, gaseous exoplanets and discovered a hidden ring around Saturn. In honor of Spitzer's Sweet 16 in space, enjoy 16 jaw-dropping images from its mission here. 

5. Earth as Seen Through Our Astronauts’ Eyes Show  Perspective Changing Views

“That's here. That's home. That's us.” – Carl Sagan

Seeing Earth from space can alter an astronauts’ cosmic perspective, a mental shift known as the “Overview Effect.” First coined by space writer Frank White in 1987, the Overview Effect is described as a feeling of awe for our home planet and a sense of responsibility for taking care of it. See Earth from the vantage point of our astronauts in a carousel of perspective-changing views here.

6. Astronaut Christina Koch Breaks Record for Longest Single Spaceflight by Woman 

Astronaut Christina Koch (@Astro_Christina) set a record Dec. 28, 2019 for the longest single spaceflight by a woman, eclipsing the former record of 288 days set by Peggy Whitson. Her long-duration mission is helping us learn how to keep astronauts healthy for deep space exploration to the Moon and Mars. Congrats to Christina on reaching new heights! Join in the celebration and view few photos she captured from her vantage point aboard the Space Station here. 

7. Our Beautiful Planet – The Only Place We Know to Harbor Life – From Space

Earth is special. It’s the only place in the universe that we know contains life. 

On July 7, 2019, two million people joined us in celebrating its beauty with a jaw dropping carousel of our home planet, as captured by crew members aboard the International Space Station. Bright blue oceans, glowing city lights and ice-capped mountain peaks come to life in a collection of breathtaking images, found here. 

8. A Moon Even Sinatra Couldn’t Help But Sing About

Every 29 days our Moon turns over a new leaf, and on May, 18 we saw a very special one of its faces. Appearing opposite the Sun at 5:11 p.m. EDT, the world looked up to find a Blue Moon! Though the Moon didn’t actually look blue, the site of one is kind of rare. They occur on average about every two-and-a-half years when a season ends up having four full moons instead of three. Click through a carousel of high-definition lunar phases here. 

9. The Majesty of Hubble Imagery ... From Your Backyard

On December 23, a new gallery of Hubble Space Telescope images highlighting celestial objects visible to amateur and professional astronomers alike was released. All of the objects are from a collection known as the Caldwell catalog, which includes 109 interesting objects visible in amateur-sized telescopes in both the northern and southern skies. Flip through the jaw-dropping carousel here, and learn more about how you can study the night sky with Hubble here. 

10. The Moon Gets Sassy

Nobody:

The Moon: “Y'all on the way yet?” 👀

We're working on it, Moon. Under the Artemis program, we're sending the first woman and the next man to walk on your surface by 2024. Find out how we’re doing it here. 

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What was your first thought when you first saw earth from space? And what realizations did you have?

The Summer Solstice Is Here!

Today — June 20, 2024 — is the northern summer solstice. In the Northern Hemisphere, it marks the longest day of the year and the official start to summer.

We experience changing day lengths throughout the year because Earth rotates on a tilted axis as it goes around the Sun. This means during half of the year the North Pole tilts toward the Sun and in the other half it points away.

Solstices occur twice per year, when Earth’s poles are tilted closest to and farthest from the Sun.

The summer solstice is an important day for cultures around the world, especially at latitudes near the North Pole. Indigenous peoples have long marked the summer solstice with dancing and celebrations. Farmers have relied on the solstice to determine when to plant crops. The solstice’s timing also influenced the development of some calendars, like the ancient Roman calendar and the modern Gregorian calendar.

To mark the beginning of summer, here are four ways you can enjoy the Sun and the many wonders of space this season:

1. Check out the “Strawberry Moon”

June is the month of the Strawberry Moon. This name originates with the Algonquin tribes. June is when strawberries are ready for harvest in the northeastern United States, where the Algonquin people traditionally live. The full Strawberry Moon this year happens tomorrow night — June 21, 2024. Grab a pair of binoculars to see it in detail.

2. Celebrate the Heliophysics Big Year!

During the Heliophysics Big Year, we are challenging you to participate in as many Sun-related activities as you can. This month’s theme is performance art. We’re looking at how various kinds of performance artists are moved by the Sun and its influence on Earth. For example, check out this Sun song!

Find out how to get involved here: https://science.nasa.gov/sun/helio-big-year/.

3. Listen to a space-cast

NASA has a ton of great space podcasts. Take a listen to Curious Universe’s Here Comes the Sun series to learn all about our closest star, from how it causes weather in space, to how you can help study it! For even more podcasts, visit our full list here: https://www.nasa.gov/podcasts.

4. Make sunspot cookies

The Sun sometimes has dark patches called sunspots. You can make your own sunspots with our favorite cookie recipe. Real sunspots aren’t made of chocolate, but on these sunspot cookies they are. And they're delicious.

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Three NASA Telescopes Look at an Angry Young Star Together

Science is a shared endeavor. We learn more when we work together. Today, July 18, we’re using three different space telescopes to observe the same star/planet system!

As our Transiting Exoplanet Survey Satellite (TESS) enters its third year of observations, it's taking a new look at a familiar system this month. And today it won't be alone. Astronomers are looking at AU Microscopii, a young fiery nearby star – about 22 million years old – with the TESS, NICER and Swift observatories.

TESS will be looking for more transits – the passage of a planet across a star – of a recently-discovered exoplanet lurking in the dust of AU Microscopii (called AU Mic for short). Astronomers think there may be other worlds in this active system, as well!

Our Neutron star Interior Composition Explorer (NICER) telescope on the International Space Station will also focus on AU Mic today. While NICER is designed to study neutron stars, the collapsed remains of massive stars that exploded as supernovae, it can study other X-ray sources, too. Scientists hope to observe stellar flares by looking at the star with its high-precision X-ray instrument.

Scientists aren't sure where the X-rays are coming from on AU Mic — it could be from a stellar corona or magnetic hot spots. If it's from hot spots, NICER might not see the planet transit, unless it happens to pass over one of those spots, then it could see a big dip!

A different team of astronomers will use our Neil Gehrels Swift Observatory to peer at AU Mic in X-ray and UV to monitor for high-energy flares while TESS simultaneously observes the transiting planet in the visible spectrum. Stellar flares like those of AU Mic can bathe planets in radiation.

Studying high-energy flares from AU Mic with Swift will help us understand the flare-rate over time, which will help with models of the planet’s atmosphere and the system’s space weather. There's even a (very) small chance for Swift to see a hint of the planet's transit!

The flares that a star produces can have a direct impact on orbiting planets' atmospheres. The high-energy photons and particles associated with flares can alter the chemical makeup of a planet's atmosphere and erode it away over time.

Another time TESS teamed up with a different spacecraft, it discovered a hidden exoplanet, a planet beyond our solar system called AU Mic b, with the now-retired Spitzer Space Telescope. That notable discovery inspired our latest poster! It’s free to download in English and Spanish.

Spitzer’s infrared instrument was ideal for peering at dusty systems! Astronomers are still using data from Spitzer to make discoveries. In fact, the James Webb Space Telescope will carry on similar study and observe AU Mic after it launches next year.

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Astronaut Journal Entry - Pre-Launch

Currently, six humans are living and working on the International Space Station, which orbits 250 miles above our planet at 17,500mph. Below you will find a real journal entry written by NASA astronaut Scott Tingle.

To read more entires from this series, visit our Space Blogs on Tumblr.

Our crew just finished the final training event before the launch. Tomorrow, at 13:20 local time (Baikonur), we will strap the Soyuz MS-07 spacecraft to our backs and fly it to low Earth orbit. We will spend 2.5 days in low Earth orbit before docking to the MRM-1 docking port on the International Space Station (ISS). There we will begin approximately 168 days of maintenance, service and science aboard one of the greatest engineering marvels that humans have ever created.

Today was bittersweet. Ending a 2-year process of intense training was welcomed by all of us. We are very tired. Seeing our families for the last time was difficult. I am pretty lucky, though. My wife, Raynette, and the kids have grown up around military service and are conditioned to endure the time spent apart during extended calls-to-duty. We are also very much anticipating the good times we will have upon my return in June. Sean and Amy showed me a few videos of them mucking it up at Red Square before flying out to Baikonur. Eric was impressed with the Russian guards marching in to relieve the watch at Red Square. Raynette was taking it all in stride and did not seem surprised by any of it. I think I might have a family of mutants who are comfortable anywhere. Nice! And, by the way, I am VERY proud of all of them!

Tomorrow’s schedule includes a wake-up at 04:00, followed by an immediate medical exam and light breakfast. Upon returning to our quarters, we will undergo a few simple medical procedures that should help make the 2.5-day journey to ISS a little more comfortable. I’ve begun prepping with motion sickness medication that should limit the nausea associated with the first phases of spaceflight. I will continue this effort through docking. This being my first flight, I’m not sure how my body will respond and am taking all precautions to maintain a good working capability. The commander will need my help operating the vehicle, and I need to not be puking into a bag during the busy times. We suit up at 09:30 and then report to the State Commission as “Готовы к Полёту”, or “Ready for Flight”. We’ll enter the bus, wave goodbye to our friends and family, and then head out to the launch pad. Approximately 2 kilometers from the launch pad, the bus will stop. 

The crew will get out, pee on the bus’s tire, and then complete the last part of the drive to the launch pad. This is a traditional event first done by Yuri Gagarin during his historic first flight and repeated in his honor to this day. We will then strap in and prepare the systems for launch. Next is a waiting game of approximately 2 hours. Ouch. The crew provided five songs each to help pass the time. My playlist included “Born to Run” (Springsteen), “Sweet Child O’ Mine” (Guns and Roses), “Cliffs of Dover” (Eric Johnson), “More than a Feeling” (Boston), and “Touch the Sky” (Rainbow Bridge, Russian). Launch will happen precisely at 13:20.

I think this sets the stage. It’s 21:30, only 6.5 hours until duty calls. Time to get some sleep. If I could only lower my level of excitement!

Find more ‘Captain’s Log’ entries HERE.

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Under Pressure

Structural Tests Underway for Top of World's Most Powerful Rocket

Testing is underway at NASA’s Marshall Space Flight Center in Huntsville, Alabama, on the agency’s new Space Launch System, the world’s most powerful rocket. SLS and NASA’s Orion spacecraft will enable deep-space missions, beginning a new era of exploration beyond Earth’s orbit.

Engineers at Marshall have stacked four qualification articles of the upper part of SLS into a 65-foot-tall test stand using more than 3,000 bolts to hold the hardware together. Tests are currently underway to ensure the rocket hardware can withstand the pressures of launch and flight. 

The integrated tests consists of:

1. Launch Vehicle Adapter

2. Frangible Joint Assembly

3. Interim Cryogenic Propulsion Stage

4. Orion Stage Adapter

Engineers are using 28 load pistons to push, pull and twist the rocket hardware, subjecting it to loads up to 40 percent greater than that expected during flight. More than 100 miles of cables are transmitting measurements across 1,900 data channels.

The Launch Vehicle Stage Adapter, LVSA, connects the SLS core stage and the Interim Cryogenic Propulsion Stage, ICPS. The LVSA test hardware is 26.5 feet tall, with a bottom diameter of 27.5 feet and a top diameter of 16.8 feet. The frangible joint, located between the LVSA and ICPS, is used to separate the two pieces of hardware during flight, allowing the ICPS to provide the thrust to send Orion onto its mission.

The ICPS is a liquid oxygen/liquid hydrogen-based system that will give Orion the big, in-space push needed to fly beyond the moon before it returns to Earth on the first flight of SLS in 2018. For this test series, the fuel tanks are filled with nonflammable liquid nitrogen and pressurized with gaseous nitrogen to simulate flight conditions. The nitrogen is chilled to the same temperature as the oxygen and hydrogen under launch conditions.

The Orion Stage Adapter connects the Orion spacecraft to the ICPS. It is 4.8 feet tall, with a 16.8-foot bottom diameter and 18-foot top diameter.

The first integrated flight for SLS and Orion will allow NASA to use the lunar vicinity as a proving ground to test systems farther from Earth, and demonstrate Orion can get to a stable orbit in the area of space near the moon in order to support sending humans to deep space, including the Journey to Mars. 

For more information about the powerful SLS rocket, check out: http://nasa.gov/SLS. 

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