This artist's concept shows what the TRAPPIST-1 planetary system may look like, based on available data about the planets' diameters, masses and distances from the host star. Credit - NASA/JPL-Caltech
The planets that have been discovered so far range in size and composition. There are so-called hot Jupiters—which, as their name suggests, are gaseous worlds that orbit close to the fires of their parent planet. Others are smaller gas worlds, similar in size to Neptune.
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