CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY
Alien planet. Computer artwork of an alien gas giant planet and one of its moons. They orbit very close to their star (in the background). Many of the extrasolar planets first discovered were found in orbits very close to their stars and had masses similar to or larger than that of Jupiter. This is because the planets were often detected by effects they had on the motion of their stars, and larger, closer planets were more likely to be detected.
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