NASA's Transiting Exoplanets Survey Satellite (TESS) has discovered its first Earth-sized planet, HD 21749c, as well as a larger Neptune-like planet called HD 21749b, in a star system 53 light years away.
I write about science and nature, stargazing and eclipses.Artist's conception of HD 21749c, the first Earth-sized planet found by NASA's Transiting Exoplanets Survey Satellite , as well as its sibling, HD 21749b, a warm sub-Neptune-sized world.
Launched atop a SpaceX Falcon 9 rocket on April 18, 2018, TESS is a planet-hunting spacecraft designed to search for Earth-like planets. TESS will observe 400,000 stars across the whole sky to catch a glimpse of a planet transiting across the face of its star. TESS will also enable astronomers to measure the masses, atmospheric compositions, and other properties of many smaller exoplanets for the first time.
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