Sentences with phrase «unseen brown dwarf star»
In the 1980s, for example, researchers proposed that an unseen brown dwarf star could cause periodic extinctions on Earth by triggering fusillades of comets.
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The highly elliptical orbit, however, suggested that the gravity of an unseen object farther away from the star was pulling the planet outward, which was later detected by direct imaging as a methane brown dwarf — more below.