Evaporating exoplanet WASP-69b solves two planetary puzzles
<p>It was only a little over 30 years ago, in the early 1990s, that humanity detected our first planets in orbit around stars other than the Sun: the exoplanets. The earliest ones discovered were a bit of a surprise: they were all massive, in tight orbits around their parent stars, and extremely hot: a class known as hot Jupiters. Since that time, we’ve discovered more than 5000 exoplanets, ranging from sub-Earth sized all the way up to super-Jupiters, with a huge variety found in between. However, two puzzles have arisen:</p>
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