The next big chapter in exoplanet research has begun – NASA’s Transiting Exoplanet Survey Satellite (TESS) has started its science observations. This is exciting since TESS will be searching for rocky, Earth-like and potentially habitable planets orbiting nearby stars.
TESS is a follow-up mission to the Kepler Space Telescope, which is now almost out of fuel. Kepler alone has discovered thousands of exoplanets, but most of those ones are more distant. TESS will look at planets closer to our Solar System, which could be studied more closely by other missions/telescopes.
“I’m thrilled that our new planet hunter mission is ready to start scouring our Solar System’s neighborhood for new worlds,” said Paul Hertz, NASA Astrophysics division director at Headquarters, Washington. “Now that we know there are more planets than stars in our universe, I look forward to the strange, fantastic worlds we’re bound to discover.”
The science observations officially began on July 25, 2018, and the first data is scheduled to be sent back to Earth in August. After that, TESS will relay back data every 13.5 days, when the spacecraft is closest to Earth. Wasting no time, the TESS science team will immediately start searching the data for new planets.
Like Kepler, TESS will look for planets transiting their stars, but will focus on about 200,000 nearby, brighter stars across the sky. Kepler looked at more distant stars, in much smaller sections of the sky. Since Kepler already found over 3,500 exoplanets, even in smaller fields of view, it is expected that TESS will also find many more in its two-year sky-wide survey. The stars that TESS looks at will be 30-100 times brighter than those surveyed by Kepler, and cover an area of sky 400 times larger than what Kepler covered. TESS will also focus on searching for smaller rocky planetslike Earth and super-Earths (larger than Earth but smaller than Uranus or Neptune). Smaller worlds like this are now known to be the most common in our galaxy, and scientists estimate there are billions of planets in our galaxy alone.
TESS was launched on April 18, 2018 aboard a SpaceX Falcon 9 rocket from Launch Complex 40 at Cape Canaveral Air Force Station in Florida.
“We are thrilled TESS is on its way to help us discover worlds we have yet to imagine, worlds that could possibly be habitable, or harbor life,” said Thomas Zurbuchen, associate administrator of NASA’s Science Mission Directorate in Washington. “With missions like the James Webb Space Telescope to help us study the details of these planets, we are ever the closer to discovering whether we are alone in the universe.
Since the planets that TESS finds will be closer, it will be easier for other follow-up telescopes, such as the upcoming James Webb Space Telescope (JWST), to examine their compositions and atmospheres and assess them for possible habitability. Such observations will even search for potential biomarker gases in the atmospheres, which could indicate life of some kind.
“The targets TESS finds are going to be fantastic subjects for research for decades to come,” said Stephen Rinehart, TESS project scientist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “It’s the beginning of a new era of exoplanet research.”
“This unique new data will comprise a treasure trove for astronomers throughout the world for many decades to come,” Ricker said. As TESS Project Manager Jeff Volosin at NASA’s Goddard Space Flight Center in Greenbelt, Md. also eloquently noted, “I’m still hopeful that in my lifetime, we will discover the existence of life outside of our Solar System and I’m excited to be part of a NASA mission that serves as a key stepping stone in that search.”
TESS will essentially continue where Kepler leaves off, searching for many more worlds out there, while also being able to more fully assess their potential for supporting life of some kind. While thousands of exoplanets have already been discovered, and with many more to come, TESS will help scientists to better determine which ones are the most promising in the search for life elsewhere.
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