🔄FROM THE ARCHIVE: The heavenly orbs are not quite stars and not quite planets.
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.
“According to that definition, it should be a planet. But if you define that a planet should form around a star, then it’s not really a planet, either,” Fontanive said. She calls them “planetary mass brown dwarfs.” Brown dwarfs are somewhat in between both objects, but more like stars. They are larger and warmer than planets, and unlike gas giant planets, they can fuse deuterium, a form of hydrogen with one neutron, into helium. But brown dwarfs can’t create the main nuclear reactions that power stars like our Sun. They are destined to cool down and grow faint. Many are likely too chilly to sufficiently warm any planets that might orbit them.
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