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© Universität Bern / University of Bern, Illustration: Thibaut Roger Artist s composition of the two newly discovered brown dwarfs.Pluto is not a planet, according to the vast majority of astronomers. While it orbits the Sun and is mostly round, it does not orbit alone, instead traversing the solar system accompanied by several moons, including a companion almost half its size. This is the main reason for its demotion in 2006. A few holdouts continue to debate this definition, but they may have a new epistemic challenge to contend with: What makes a star? When a distant object is too small and too faint to be a star, but also too big to be an exoplanet, and is not solitary, how can you be sure what it is?

United statesMauna keaUniversity of texas at austinUniversity of bernBern university ofBrown dwarfsThibaut rogerWill bestHubble space telescopeCanada france hawaii telescopeAstrophysical journalஒன்றுபட்டது மாநிலங்களில்ம una னா கீபல்கலைக்கழகம் ஆஃப் டெக்சாஸ் இல் ஆஸ்டின்பல்கலைக்கழகம் ஆஃப் பெர்ன்பெர்ன் பல்கலைக்கழகம் ஆஃப்