TESS, the satellite launched by NASA last month that will search thousands of stars for Earth-like exoplanets, has just sent back its first test image. It’s just a quick one, not “science-quality,” but it does give you an idea of the scale of the mission: the area TESS will eventually document is 400 times the area covered by this shot.
What you see above is the star field around the constellation Centaurus; this 2-second exposure captured more than 200,000 stars. That’s just in one image from one of the four cameras on board; the Transiting Exoplanet Survey Satellite will employ all four during its mission, watching individual regions of space for 27 days straight over the course of two orbits.
Here’s a crop from the center:
Repeated high-resolution imagery of these star fields will let the team on the ground watch for any that dim briefly, indicating that a planet may be passing in between the star and our solar system. This will let it watch far, far more stars than the otherwise similar Kepler mission, which even by looking at only dim stars with a relatively narrow field of view, found evidence of thousands of exoplanets for scientists to …read more
Source: Tech Crunch