Nasa Tess spacecraft to prowl for planets as galactic scout
Look up at the sky tonight. Every star you see—plus hundreds of thousands, even millions more—will come under the intense stare of Nasa’s newest planet hunter.
Set to lift off early next week, the Tess spacecraft will prowl for planets around the closest, brightest stars. These newfound worlds eventually will become prime targets for future telescopes looking to tease out any signs of life.
It will be the most extensive survey of its kind from orbit, with Tess, a galactic scout, combing the neighborhood as never before.
Scientists expect Tess to find thousands of exoplanets— the term for planets outside our solar system.
Nasa’s astrophysics director, Paul Hertz, said missions like Tess will help answer whether we’re alone—or just lucky enough to have “the best prime real estate in the galaxy.”
Tess—short for Transiting Exoplanet Survey Satellite—is the heir apparent to the wildly successful Kepler Space Telescope, the pioneer of planetary census. Kepler’s fuel tank is running precariously low after nine years of flight, and Nasa expects it to shut down within several months.
Still on the lookout from on high, Kepler alone has discovered more than 2,600 confirmed exoplanets. Even more candidates await confirmation.
The exoplanet count, from all observatories in space and on Earth over the past couple of decades, stands at more than 3,700 confirmed with 4,500 on the strong contender list.
About 50 are believed to be potentially habitable. They have the right size and the right orbit of their star to support surface water and, at least theoretically, to support life.
Most of the Kepler-identified planets are so far away that it would take monster-size telescopes to examine them more. So astronomers want to focus on stars that are vastly brighter and closer to home—close enough for Nasa’s upcoming James Webb Space Telescope to scrutinize the atmospheres of planets lurking in their sun’s shadows. Powerful ground telescopes also will join in the detailed observations, as well as enormous observatories still on the drawing board.
The total mission price tag for Tess is $337 million. /