Narrow dense rings of comets are coming together to form planets on the outskirts of at least 3 distant solar systems, astronomers have found in data from a pair of NASA telescopes. Estimating the mass of these rings from the amount of light they reflect shows that each of these developing planets is at least the size of a few Earths, according to Carey Lisse, a planetary scientist at the Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Maryland.
Over the past few decades, using powerful NA...
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