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Trappist1 - Blog Posts
Largest Batch of Earth-size, Habitable Zone Planets
Our Spitzer Space Telescope has revealed the first known system of seven Earth-size planets around a single star. Three of these planets are firmly located in an area called the habitable zone, where liquid water is most likely to exist on a rocky planet.
This exoplanet system is called TRAPPIST-1, named for The Transiting Planets and Planetesimals Small Telescope (TRAPPIST) in Chile. In May 2016, researchers using TRAPPIST announced they had discovered three planets in the system.
Assisted by several ground-based telescopes, Spitzer confirmed the existence of two of these planets and discovered five additional ones, increasing the number of known planets in the system to seven.
This is the FIRST time three terrestrial planets have been found in the habitable zone of a star, and this is the FIRST time we have been able to measure both the masses and the radius for habitable zone Earth-sized planets.
All of these seven planets could have liquid water, key to life as we know it, under the right atmospheric conditions, but the chances are highest with the three in the habitable zone.
At about 40 light-years (235 trillion miles) from Earth, the system of planets is relatively close to us, in the constellation Aquarius. Because they are located outside of our solar system, these planets are scientifically known as exoplanets. To clarify, exoplanets are planets outside our solar system that orbit a sun-like star.
In this animation, you can see the planets orbiting the star, with the green area representing the famous habitable zone, defined as the range of distance to the star for which an Earth-like planet is the most likely to harbor abundant liquid water on its surface. Planets e, f and g fall in the habitable zone of the star.
Using Spitzer data, the team precisely measured the sizes of the seven planets and developed first estimates of the masses of six of them. The mass of the seventh and farthest exoplanet has not yet been estimated.
For comparison…if our sun was the size of a basketball, the TRAPPIST-1 star would be the size of a golf ball.
Based on their densities, all of the TRAPPIST-1 planets are likely to be rocky. Further observations will not only help determine whether they are rich in water, but also possibly reveal whether any could have liquid water on their surfaces.
The sun at the center of this system is classified as an ultra-cool dwarf and is so cool that liquid water could survive on planets orbiting very close to it, closer than is possible on planets in our solar system. All seven of the TRAPPIST-1 planetary orbits are closer to their host star than Mercury is to our sun.
The planets also are very close to each other. How close? Well, if a person was standing on one of the planet’s surface, they could gaze up and potentially see geological features or clouds of neighboring worlds, which would sometimes appear larger than the moon in Earth’s sky.
The planets may also be tidally-locked to their star, which means the same side of the planet is always facing the star, therefore each side is either perpetual day or night. This could mean they have weather patterns totally unlike those on Earth, such as strong wind blowing from the day side to the night side, and extreme temperature changes.
Because most TRAPPIST-1 planets are likely to be rocky, and they are very close to one another, scientists view the Galilean moons of Jupiter – lo, Europa, Callisto, Ganymede – as good comparisons in our solar system. All of these moons are also tidally locked to Jupiter. The TRAPPIST-1 star is only slightly wider than Jupiter, yet much warmer.
How Did the Spitzer Space Telescope Detect this System?
Spitzer, an infrared telescope that trails Earth as it orbits the sun, was well-suited for studying TRAPPIST-1 because the star glows brightest in infrared light, whose wavelengths are longer than the eye can see. Spitzer is uniquely positioned in its orbit to observe enough crossing (aka transits) of the planets in front of the host star to reveal the complex architecture of the system.
Every time a planet passes by, or transits, a star, it blocks out some light. Spitzer measured the dips in light and based on how big the dip, you can determine the size of the planet. The timing of the transits tells you how long it takes for the planet to orbit the star.
The TRAPPIST-1 system provides one of the best opportunities in the next decade to study the atmospheres around Earth-size planets. Spitzer, Hubble and Kepler will help astronomers plan for follow-up studies using our upcoming James Webb Space Telescope, launching in 2018. With much greater sensitivity, Webb will be able to detect the chemical fingerprints of water, methane, oxygen, ozone and other components of a planet’s atmosphere.
At 40 light-years away, humans won’t be visiting this system in person anytime soon...that said...this poster can help us imagine what it would be like:
Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com
Life in The TRAPPIST_1 System
The Potential for Life is higher than ever on The TRAPPIST_1 Exoplanets, a Researcher says. http://wr.al/1AePv
Ricostruzione 3D dalla superficie del pianeta Trappist-1D. Gli altri sei pianeti sono vicini e tutti ben visibili all'orizzonte. https://m.youtube.com/watch?v=o2MgG6KhO1E&version=3&rel=0&autoplay=1
SCIENCE PACKED WEEK: NASA Co-Op #3 Week 7
The amount of science that occurred this week was so overwhelming that I had to make the title all caps. Five major science related events occurred this week... I was a Judge at the FIRST Robotics Tech Challenge SE Texas Championship, assisted in astronaut user testing, watched a briefing about seven new Earth-like planets found, watched SpaceX Dragon cargo ship dock to the International Space Station, and trained on the job in Mission Control during the Dragon cargo ship unstow.
1. FIRST Robotics Tech Challenge Judging
FTC is like FRC (that I was in back in high school) except FTC robots are 18in x 18in x 18in, rather than 120lb robots we built, and play a different game. This year's game is Velocity Vortex which required students to build a robot in only six weeks that could lift large medicine balls and shoot Whiffle balls at a target. I had a great time at the FIRST Tech Challenge's SE Texas Regional Champs judging teams. It was a challenge to judge teams when there was so much talent to sift through! Unlike Minnesota FRC's one regional these TX FTC folks have to go through three levels of competition to get to the World Championship. Worlds will be held in Houston this year April 19-22.
Volunteer with at a FIRST Robotics event.
2. SpaceX Dragon Launch to Space Station
Launch of Falcon9 carrying dragon cargo to Space Station went wonderfully. Additionally, a stage of Flacon 9 successfully landed ON LAND back in Florida to be refurbished and reused. This private space industry/ US Government/ International effort demonstrates Scott Kelly's quote: "Spaceflight is the biggest team sport there is, and it's incredibly important that we all work together to make what is seemingly impossible possible." Kelly said this when he handed over command of the ISS to fellow NASA astronaut Tim Kopra during his Year In Space Mission in 2016. Despite public belief, spaceflight is a team collaboration (not competition) between government, private and international groups.
3. Astronaut User Testing
In parallel to hands free stowage app development I am "Project Manager-ing" for, I am helping with a similar app on an iPad. This iPad app is going through user testing to get approved and sent up to Space Station. I assisted with user testing including participants from ISO and participants from the astronaut crew office who have flown. The test participants were asked to gather items in the ISS mock-ups and pack them into the SpaceX Dragon cargo ship mock up. I was available for test participants to ask about space station locations. Additionally I made the “play” stowage items that participants gathered and packed.
4. New Earth-like Planets Found
First known system of seven Earth-sized planets has been found! This solar system is called TRAPPIST-1 and the planets are named letters "a" through "g" from closest to furthest from the Star. These planets are one hundred times closer to their star and closer to each other than the planets in our solar system. This means that on the surface of one planet you can see other planets clearly like our moon. Since this star is significantly cooler than ours which leaves three of these planets habitable despite close proximity to the star. At light speed it would take 39yrs to reach this solar system. In 2016 in Chile, researchers used the TRAPPIST telescope to find two of the planets in TRAPPIST-1. In part of a global effort NASA's Spitzer telescope found total of seven reported this week. In the future NASA's James Webb telescope, set to launch in 2018, will take a closer look at TRAPPIST-1.
Check out what the surface of planet TRAPPIST-1d looks like. Find the other six planets in the sky.
Take a 3D tour of TRAPPIST solar system.
NASA's press release about the new found exoplanets.
Full breif/ exoplanet discovery announcement video here, it's only 30mins long with press questions.
5. Dragon Cargo Ship Unstow
Conducted on the job training with DISO (Dragon Inventory Stowage Officer) in a Mission Control support room. DISOs are in charge of monitoring the astronaut’s cargo unstow of SpaceX’s dragon cargo ship docked to the International Space Station. Dragon delivered many scientific experiments, food and temperature sensitive items. During unstow astronauts Peggy Whitson and Thomas Pesquet were about an hour ahead of schedule. This crew is extremely efficient and is ahead of schedule for every task, even spacewalks. Pesquet unpacked cold bags where temperature sensitive science is stored and should be unpacked quickly. Whitson retrieved CTBs (Cargo Transfer Bags) from Dragon which included science that needed kept at a particular temperature and pressure. CTBs are White, rectangular, cushiony, sewn bags sealed with a zipper and are used on every flight to contain items.
Unloading items from dragon in an elegant organized fashion is critical because SpaceX must always know its center of gravity. If there is a Dragon emergency in which case dragon cannot stay on ISS and needs to return to Earth the center of gravity is available for accurate trajectory calculations. During my on the job training I followed the procedures sent to crew and recorded changes astronauts made to the procedure. I listened to the voice loops of each of the flight control consoles communicating to each other about the astronaut’s tasks. I was able to confirm “words”, what was spoken over the loop, to the official DISO flight controller as a second check. Sometimes DISO are asked to confirm that an unstow procedure is being completed correctly and sometimes DISO needs to call the Flight Director to point out a stowage item concern.