NASA’s TESS Is Getting Us One Step Closer To Another Earth, Here’s How

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NASA's Transiting Exoplanet Survey Satellite (TESS) discovered 21 planets outside our solar system during its first year in space. How does TESS categorize a planet?
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TESS Completes First Year of Survey, Turns to Northern Sky
"NASA’s Transiting Exoplanet Survey Satellite (TESS) has discovered 21 planets outside our solar system and captured data on other interesting events occurring in the southern sky during its first year of science."
Tiny dips in star brightnesses reveal 3 exocomets
"Astronomers have also detected some exocomets, or comets orbiting faraway stars, too. When you think of it, exocomet detections are an amazing accomplishment! In contrast to planets, which are relatively solid and thousands of miles wide, the nuclei, or cores, of comets are only a few miles wide."
Kepler vs. TESS
"TESS will survey the entire sky, looking at 400 times more stars than Kepler did throughout its lifetime. TESS will do this with four identical telescopes, which, combined, observe a 24-degree patch of sky at any one point. Each 27 days, TESS changes direction and looks for planets around a different set of stars in a new ‘sector’."
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