What Is A Supermoon Lunar Eclipse?

A Wider Set of Eyes on the Universe

After years of preparatory studies, we are formally starting an astrophysics mission designed to help unlock the secrets of the universe. 

Introducing…

the Wide Field Infrared Survey Telescope, aka WFIRST.

With a view 100 times bigger than that of our Hubble Space Telescope, WFIRST will help unravel the secrets of dark energy and dark matter, and explore the evolution of the cosmos. It will also help us discover new worlds and advance the search for planets suitable for life.

WFIRST is slated to launch in the mid-2020s. The observatory will begin operations after traveling about one million miles from Earth, in a direction directly opposite the sun.

Telescopes usually come in two different “flavors” - you have really big, powerful telescopes, but those telescopes only see a tiny part of the sky. Or, telescopes are smaller and so they lack that power, but they can see big parts of the sky. WFIRST is the best of worlds.

No matter how good a telescope you build, it’s always going to have some residual errors. WFIRST will be the first time that we’re going to fly an instrument that contains special mirrors that will allow us to correct for errors in the telescope. This has never been done in space before!

Employing multiple techniques, astronomers will also use WFIRST to track how dark energy and dark matter have affected the evolution of our universe. Dark energy is a mysterious, negative pressure that has been speeding up the expansion of the universe. Dark matter is invisible material that makes up most of the matter in our universe.

Single WFIRST images will contain over a million galaxies! We can’t categorize and catalogue those galaxies on our own, which is where citizen science comes in. This allows interested people in the general public to solve scientific problems.

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Astronaut Candidates Report for Duty

Fourteen new Astronaut Candidates have reported to our Johnson Space Center in Houston for duty on Monday, Aug. 21! Two astronauts from the Canadian Space Agency (CSA), along with our 12 new astronaut candidates arrived for their first day of work. We selected these 12 individuals from a record number of more than 18,000 applicants. 

This excited group of outstanding individuals will begin 2 years of training, along with 2 Canadian astronauts, in 5 key areas before being assigned to a mission.

What 5 areas? Let’s take a look...

1. Operate in T-38 Jets

Astronauts must be able to safely operate in the T-38 jets as either a pilot or back seater. 

2. Operate + Maintain the International Space Station

Astronauts learn to operate and maintain the complex systems aboard the International Space Station. Did you know they recycle their water there? Today’s coffee is...well, tomorrow’s coffee too. 

3. Learn How to Spacewalk

Or should we say waterwalk? Astronauts demonstrate the skills to complete complex spacewalk tasks in our Neutral Buoyancy Laboratory. This 6.2 million gallon pool contains a mockup of the space station and is a close simulation to microgravity.

4. Learn to Operate a Robot

Astronauts train in Canada for 2 weeks to learn how to capture visiting vehicles and more with the space station’s Canadarm 2 robotic arm. 

5. Learn a Foreign Language

Astronauts must be fluent in both English and Russian, the two official languages on the International Space Station. 

But before they begin all this training...they had to report for duty...

This group reported for Johnson Space Center on eclipse day and was sworn in as NASA’s Astronaut Candidate Class of 2017.

They even got to experience the partial solar eclipse together, what a great first day!

Follow their training journey online by following @NASA_Astronauts on Twitter. 

Get to know them better and watch their individual interviews here: go.nasa.gov/NewAstronauts. 

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10 Things: Why Cassini Mattered

One year ago, on Sept. 15, 2017, NASA’s Cassini spacecraft ended its epic exploration of Saturn with a planned dive into the planet’s atmosphere--sending back new science to the last second. The spacecraft is gone, but the science continues. Here are 10 reasons why Cassini mattered...

1. Game Changers

Cassini and ESA (European Space Agency)’s Huygens probe expanded our understanding of the kinds of worlds where life might exist.

2. A (Little) Like Home

At Saturn’s largest moon, Titan, Cassini and Huygens showed us one of the most Earth-like worlds we’ve ever encountered, with weather, climate and geology that provide new ways to understand our home planet.

3. A Time Machine (In a Sense)

Cassini gave us a portal to see the physical processes that likely shaped the development of our solar system, as well as planetary systems around other stars.

4. The Long Run

The length of Cassini’s mission enabled us to observe weather and seasonal changes over nearly half of a Saturn year, improving our understanding of similar processes at Earth, and potentially those at planets around other stars.

5. Big Science in Small Places

Cassini revealed Saturn’s moons to be unique worlds with their own stories to tell.

6. Ringscape

Cassini showed us the complexity of Saturn’s rings and the dramatic processes operating within them.

7. Pure Exploration

Some of Cassini’s best discoveries were serendipitous. What Cassini found at Saturn prompted scientists to rethink their understanding of the solar system.

8. The Right Tools for the Job

Cassini represented a staggering achievement of human and technical complexity, finding innovative ways to use the spacecraft and its instruments, and paving the way for future missions to explore our solar system.

9. Jewel of the Solar System

Cassini revealed the beauty of Saturn, its rings and moons, inspiring our sense of wonder and enriching our sense of place in the cosmos.

10. Much Still to Teach Us

The data returned by Cassini during its 13 years at Saturn will continue to be studied for decades, and many new discoveries are undoubtedly waiting to be revealed. To keep pace with what’s to come, we’ve created a new home for the mission--and its spectacular images--at https://solarsystem.nasa.gov/cassini.

Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com.  

Astronaut Training: 5 Things You Need to Know

NASA honored the first class of astronaut candidates to graduate under the Artemis program on Friday, Jan. 10, at our Johnson Space Center in Houston.

Out of a record 18,000 applicants, the 11 new astronauts, alongside two from the Canadian Space Agency, have completed two years of training and are now eligible for spaceflight. One day they could embark on missions to the International Space Station, the Moon and even Mars.

Here are five of the training criteria they had to check off to graduate from astronaut candidate to astronaut:

1. Piloting T-38 Jets

Astronauts have been training in T-38 jets since 1957 because the sleek, white jets require crew members to think quickly in dynamic situations and to make decisions that have real consequences. This type of mental experience is critical to preparing for the rigors of spaceflight. It also familiarizes astronaut candidates with checklists and procedures. To check off this training criteria, candidates must be able to safely operate in the T-38 as either a pilot or back seater. 

2. Knowing International Space Station Systems

We are currently flying astronauts to the International Space Station every few months. Astronauts aboard the space station are conducting experiments benefiting humanity on Earth and teaching us how to live longer in space. Astronaut candidates learn to operate and maintain the complex systems aboard the space station as part of their basic training.

3. Conducting Spacewalks

Spacewalks are the hardest thing, physically and mentally, that astronauts do. Astronaut candidates must demonstrate the skills to complete complex spacewalks in our Neutral Buoyancy Laboratory (giant pool used to simulate weightlessness). In order to do so, they will train on the life support systems within the spacesuit, how to handle emergency situations that can arise and how to work effectively as a team to repair the many critical systems aboard the International Space Station to keep it functioning as our science laboratory in space.  

4. Operating Robotics

Astronaut candidates learn the coordinate systems, terminology and how to operate the space station’s two robotic arms called Canadarm2 and Dextre. They train in Canada for a two-week session where they develop more complex robotics skills including capturing visiting cargo vehicles with the arm. The arm, built by the Canadian Space Agency, is capable of handling large cargo and hardware and it helped build the entire space station. It has latches on either end, allowing it to be moved by both flight controllers on the ground and astronauts in space to various parts of the station.

5. Learning Russian Language

The official languages of the International Space Station are English and Russian. All crew members – regardless of what country they come from – are required to know both. NASA astronauts train with their Russian crew mates so it makes sense that they should be able to speak Russian. Astronaut candidates start learning the language at the beginning of their training and train every week, as their schedule allows. 

Now, they are ready for their astronaut pin!

After completing this general training, the new astronauts could be assigned to missions performing research on the International Space Station, launching from American soil on spacecraft built by commercial companies, and launching on deep space missions on our new Orion spacecraft and Space Launch System rocket. 

Watch the Astronaut Candidate Graduation Ceremony

Watch a recording of the astronaut candidate graduation ceremony on our YouTube channel. 

So You Want to Be an Astronaut?

This spring, we’ll once again be accepting applications for the next class of astronauts! Stay tuned to www.nasa.gov/newastronauts for upcoming information on how you can explore places like the Moon and Mars.

Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com.

Ever wanted to ask a NASA astronaut a question? Here’s your chance!

NASA astronaut Nick Hague will be taking your questions in an Answer Time session on Thursday, January 16 from 12pm - 1pm ET here on NASA’s Tumblr! Find out what it’s like to live and work 254 miles above our planet’s surface. Make sure to ask your question now by visiting http://nasa.tumblr.com/ask!

Nick Hague was selected as one of eight members of the 21st NASA Astronaut class in 2013. Hague was the first astronaut from his class to be assigned to a mission which launched on October 11, 2018. Unfortunately, he and his crewmate Alexey Ovchinin, of the Russian space agency Roscosmos, were forced to abort the mission when a rocket booster experienced a malfunction shortly after the launch of their Soyuz MS-10. The aborted spacecraft landed safely. 

His first flight to the International Space Station was from March 2019 through October 2019 as a a part of the Expeditions 59 and 60 crew. Together, the crew conducted hundreds of experiments, including investigations into devices that mimic the structure and function of human organs, free-flying robots and an instrument to measure Earth’s distribution of carbon dioxide. While at the International Space Station, Hague conducted three spacewalks, totaling 19 hours and 56 minutes with a total of 203 days in space.

Nick Hague Fun Facts:

Hague was awarded the Order of Courage from the Russian Federation for his actions during the Expedition 57/58 launch abort. 

Hague was selected for the Air Force Fellows program where he was assigned as a member of the personal staff in the U.S. Senate, advising on matters of national defense and foreign policy.

He was a top flight test engineer in the U.S. Air Force.

He deployed five months to Iraq in support of Iraqi Freedom, conducting experimental airborne reconnaissance.

He enjoys exercise, flying, snow skiing and scuba.

Follow Nick Hague on Twitter at @AstroHague and follow NASA on Tumblr for your regular dose of space.

We’re On a Mission to Study The Zone Where Earth Meets Space!

We’re launching ICON — short for Ionospheric Connection Explorer — a mission to explore the dynamic region where Earth meets space: the ionosphere!

Earth’s ionosphere stretches from 50 to 400 miles above the ground, overlapping the top of our atmosphere and the very beginning of space. The Sun cooks gases there until they lose an electron (or two or three), creating a sea of electrically charged particles. But, the ionosphere also responds to weather patterns from Earth rippling up. These changes are complex and tricky to understand.

That’s why we’re launching ICON! Changes in the ionosphere can affect astronauts, satellites and communications signals we use every day, like radio or GPS. Understanding these changes could help us eventually predict them — and better protect our technology and explorers in space.

ICON will track changes in the ionosphere by surveying airglow. It’s a natural feature of Earth’s that causes our atmosphere to constantly glow. The Sun excites gases in the upper atmosphere, so they emit light. From 360 miles above Earth, ICON will photograph airglow to measure the ionosphere’s winds, composition and temperature. ICON also carries an instrument that will capture and measure the particles directly around the spacecraft.

ICON is scheduled to launch on Oct. 10, on a Northrop Grumman Pegasus XL rocket. The night of launch, the rocket is flown up to the sky by Northrop Grumman’s L-1011 Stargazer airplane, which takes off from Cape Canaveral Air Force Station in Florida. From 40,000 feet above the open ocean, the Pegasus XL rocket drops from the plane and free-falls for about five seconds before igniting and carrying ICON into orbit.   

NASA TV coverage of the launch starts at 9:15 p.m. EDT on Oct. 10 at nasa.gov/live. You can also follow along on Twitter, Facebook or at nasa.gov/icon.

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10 Things: Journey to the Center of Mars

May the fifth be with you because history is about to be made: As early as May 5, 2018, we’re set to launch Mars InSight, the very first mission to study the deep interior of Mars. We’ve been roaming the surface of Mars for a while now, but when InSight lands on Nov. 26, 2018, we’re going in for a deeper look. Below, 10 things to know as we head to the heart of Mars.

Coverage of prelaunch and launch activities begins Thursday, May 3, on NASA Television and our homepage.

1. What’s in a name? 

"Insight" is to see the inner nature of something, and the InSight lander—a.k.a. Interior Exploration using Seismic Investigations, Geodesy and Heat Transport—will do just that. InSight will take the "vital signs" of Mars: its pulse (seismology), temperature (heat flow) and reflexes (radio science). It will be the first thorough check-up since the planet formed 4.5 billion years ago.

2. Marsquakes. 

You read that right: earthquakes, except on Mars. Scientists have seen a lot of evidence suggesting Mars has quakes, and InSight will try to detect marsquakes for the first time. By studying how seismic waves pass through the different layers of the planet (the crust, mantle and core), scientists can deduce the depths of these layers and what they're made of. In this way, seismology is like taking an X-ray of the interior of Mars.

Want to know more? Check out this one-minute video.

3. More than Mars. 

InSight is a Mars mission, but it’s also so much more than that. By studying the deep interior of Mars, we hope to learn how other rocky planets form. Earth and Mars were molded from the same primordial stuff more than 4.5 billion years ago, but then became quite different. Why didn’t they share the same fate? When it comes to rocky planets, we’ve only studied one in great detail: Earth. By comparing Earth's interior to that of Mars, InSight's team hopes to better understand our solar system. What they learn might even aid the search for Earth-like planets outside our solar system, narrowing down which ones might be able to support life.

4. Robot testing. 

InSight looks a bit like an oversized crane game: When it lands on Mars this November, its robotic arm will be used to grasp and move objects on another planet for the first time. And like any crane game, practice makes it easier to capture the prize.

Want to see what a Mars robot test lab is like? Take a 360 tour.

5. The gang’s all here. 

InSight will be traveling with a number of instruments, from cameras and antennas to the heat flow probe. Get up close and personal with each one in our instrument profiles.

6. Trifecta. 

InSight has three major parts that make up the spacecraft: Cruise Stage; Entry, Descent, and Landing System; and the Lander. Find out what each one does here.

7. Solar wings. 

Mars has weak sunlight because of its long distance from the Sun and a dusty, thin atmosphere. So InSight’s fan-like solar panels were specially designed to power InSight in this environment for at least one Martian year, or two Earth years.

8. Clues in the crust. 

Our scientists have found evidence that Mars’ crust is not as dense as previously thought, a clue that could help researchers better understand the Red Planet’s interior structure and evolution. “The crust is the end-result of everything that happened during a planet’s history, so a lower density could have important implications about Mars’ formation and evolution,” said Sander Goossens of our Goddard Space Flight Center in Greenbelt, Maryland.

9. Passengers. 

InSight won’t be flying solo—it will have two microchips on board inscribed with more than 2.4 million names submitted by the public. "It's a fun way for the public to feel personally invested in the mission," said Bruce Banerdt of our Jet Propulsion Laboratory, the mission's principal investigator. "We're happy to have them along for the ride."

10. Tiny CubeSats, huge firsts. 

The rocket that will loft InSight beyond Earth will also launch a separate NASA technology experiment: two mini-spacecraft called Mars Cube One, or MarCO. These suitcase-sized CubeSats will fly on their own path to Mars behindInSight. Their goal is to test new miniaturized deep space communication equipment and, if the MarCOs make it to Mars, may relay back InSight data as it enters the Martian atmosphere and lands. This will be a first test of miniaturized CubeSat technology at another planet, which researchers hope can offer new capabilities to future missions.

Check out the full version of ‘Solar System: 10 Thing to Know This Week’ HERE. 

Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com. 

That’s a wrap! Thank you all very much for the wonderful questions.


We’re so excited to send Perseverance off on her journey to Mars, and we will be launching on July 30 at 7:50 a.m. EDT from Kennedy Space Center in Florida. 


If today’s Answer Time got you excited, team up with us to #CoutdownToMars! We created a virtual Mars photo booth, 3D rover experience and more for you to put your own creative touch on sending Perseverance well wishes for her launch to the Red Planet! View them all, HERE. 


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What is the best and worst thing about being in a zero gravity environment?

Navigating Deep Space by Starlight

On August 6, 1967, astrophysicist Jocelyn Bell Burnell noticed a blip in her radio telescope data. And then another. Eventually, Bell Burnell figured out that these blips, or pulses, were not from people or machines.

The blips were constant. There was something in space that was pulsing in a regular pattern, and Bell Burnell figured out that it was a pulsar: a rapidly spinning neutron star emitting beams of light. Neutron stars are superdense objects created when a massive star dies. Not only are they dense, but neutron stars can also spin really fast! Every star we observe spins, and due to a property called angular momentum, as a collapsing star gets smaller and denser, it spins faster. It’s like how ice skaters spin faster as they bring their arms closer to their bodies and make the space that they take up smaller.

The pulses of light coming from these whirling stars are like the beacons spinning at the tops of lighthouses that help sailors safely approach the shore. As the pulsar spins, beams of radio waves (and other types of light) are swept out into the universe with each turn. The light appears and disappears from our view each time the star rotates.

After decades of studying pulsars, astronomers wondered—could they serve as cosmic beacons to help future space explorers navigate the universe? To see if it could work, scientists needed to do some testing!

First, it was important to gather more data. NASA’s NICER, or Neutron star Interior Composition Explorer, is a telescope that was installed aboard the International Space Station in 2017. Its goal is to find out things about neutron stars like their sizes and densities, using an array of 56 special X-ray concentrators and sensitive detectors to capture and measure pulsars’ light.

But how can we use these X-ray pulses as navigational tools? Enter SEXTANT, or Station Explorer for X-ray Timing and Navigation Technology. If NICER was your phone, SEXTANT would be like an app on it.  

During the first few years of NICER’s observations, SEXTANT created an on-board navigation system using NICER’s pulsar data. It worked by measuring the consistent timing between each pulsar’s pulses to map a set of cosmic beacons.

When calculating position or location, extremely accurate timekeeping is essential. We usually rely on atomic clocks, which use the predictable fluctuations of atoms to tick away the seconds. These atomic clocks can be located on the ground or in space, like the ones on GPS satellites. However, our GPS system only works on or close to Earth, and onboard atomic clocks can be expensive and heavy. Using pulsar observations instead could give us free and reliable “clocks” for navigation. During its experiment, SEXTANT was able to successfully determine the space station’s orbital position!

We can calculate distances using the time taken for a signal to travel between two objects to determine a spacecraft’s approximate location relative to those objects. However, we would need to observe more pulsars to pinpoint a more exact location of a spacecraft. As SEXTANT gathered signals from multiple pulsars, it could more accurately derive its position in space.

So, imagine you are an astronaut on a lengthy journey to the outer solar system. You could use the technology developed by SEXTANT to help plot your course. Since pulsars are reliable and consistent in their spins, you wouldn’t need Wi-Fi or cell service to figure out where you were in relation to your destination. The pulsar-based navigation data could even help you figure out your ETA!

None of these missions or experiments would be possible without Jocelyn Bell Burnell’s keen eye for an odd spot in her radio data decades ago, which set the stage for the idea to use spinning neutron stars as a celestial GPS. Her contribution to the field of astrophysics laid the groundwork for research benefitting the people of the future, who yearn to sail amongst the stars.  

Keep up with the latest NICER news by following NASA Universe on X and Facebook and check out the mission’s website. For more on space navigation, follow @NASASCaN on X or visit NASA’s Space Communications and Navigation website.  

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