Space

Jul.14.2017 / 2:24 PM ET

Scientists have discovered the smallest star known to science; in fact, it is so tiny that it barely qualifies as a star. Called EBLM J055557Ab, it is only slightly larger than Saturn. The star is part of a binary system, orbiting a much bigger star approximately 600 light-years from Earth.

"Our discovery reveals how small stars can be," astronomer Alexander Boetticher from the University of Cambridge said in a press release. "Had this star formed with only a slightly lower mass, the fusion reaction of hydrogen in its core could not be sustained, and the star would instead have transformed into a brown dwarf."

The issues that make this star a bit of a "borderline" case are the same that cause brown dwarves to be called "failed stars." EBLM J055557Ab is just massive enough to enable hydrogen fusion to occur in its core, forming helium, as the researcher describes in their study published in Astronomy & Astrophysics. However, it remains very faint and difficult to see; it is approximately 2,000 to 3,000 times fainter than our Sun.

This, along with its proximity to parent star EBLM J055557A, made finding the tiny star a real challenge. Initially, EBLM J055557Ab was suspected of being an exoplanet as it orbited in front of its parent star. Only closer examination of the measurements revealed its true nature.

Dim, smaller stars like this one are prime candidates for hosting worlds that could support life because they provide the milder environments in which liquid water on planetary surfaces is more likely to survive. However, these minuscule stars are mysterious to us, not just because we rarely spot them. Hopefully, scientists will have more clues for finding them moving forward, having learned from this first discovery.

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This article was originally published on Futurism.

Link:

This is the Tiniest Star Scientists Have Ever Seen - NBCNews.com