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Lonely pair of brown dwarfs found traversing the void together
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Lonely Pair of Mystifying Space Objects Found Traversing the Void
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An international research team has discovered an exotic binary system composed of two young planet-like objects, orbiting each other - and not a star.
They are planet-like because they look like giant exoplanets but they formed in the same way as stars, proving that the mechanisms driving star formation can produce rogue worlds in unusual systems - deprived of a Sun.
Star-forming processes sometimes create mysterious astronomical objects called brown dwarfs, which are smaller and colder than stars, and can have masses and temperatures down to those of exoplanets in the most extreme cases. Just like stars, brown dwarfs often wander alone through space, but can also be seen in binary systems, where two brown dwarfs orbit one another and travel together in the galaxy.
© 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?
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