--- title: "Two Tiny Stars Are Orbiting Each Other So Closely, the Entire System Could Fit In the Sun" description: "A pair of stars, one red dwarf, one brown dwarf, both of notable sizes small and large, have one of the tightest orbits ever spotted." date: "2023-08-04" modified: "2023-08-04" authors: - name: "Frank Landymore" job_title: "Contributing Writer" link: "https://futurism.com/authors/flandymore" url: "https://futurism.com/the-byte/two-stars-orbit-fit-in-the-sun" categories: - "Off-World" - "Space" tags: - "binary systems" - "brown dwarf" - "stars" - "the digest" --- # Two Tiny Stars Are Orbiting Each Other So Closely, the Entire System Could Fit In the Sun ![A pair of stars, one red dwarf, one brown dwarf, both of notable sizes small and large, have one of the tightest orbits ever spotted.]() *Illustration of a binary star on the outskirts of a globular cluster. Recent studies of such binaries by astronomers at Warwick University, UK, suggest that globular clusters could be 4 billion years younger than thought. \Image: MARK GARLICK/SCIENCE PHOTO LIBRARY via Getty Images\* ## Snug System Two newly-discovered stars are orbiting each other so closely that the entire binary system they form could fit inside the Sun — and with room to spare. As detailed in a [new study](), submitted for publication in *The Open Journal of Astrophysics*, the system consists of stellar objects known as a brown dwarf and a red dwarf, locked in an intimate cosmic tango. The system was spotted approximately 457 light years from Earth with the Zwicky Transient Facility, a comprehensive astronomical survey of the night sky, and has been designated ZTF J2020+5033. With an orbital period of just 1.9 hours, it's by far the closest orbit ever found for a brown dwarf, though the researchers suggest that such short orbits — though perhaps not *quite* as extreme as this example — could actually be somewhat common among brown dwarfs. ## Two's Company If we're being pedantic, a [brown dwarf]() isn't *quite* a star, but a substellar object — unkindly nicknamed a "failed star" — that's unable to sustain the fusion of hydrogen at its core. This newly discovered one, however, is unusually hefty at just over 80 times the mass of Jupiter while sharing almost the same radius. This puts the brown dwarf right on the precipice between substellar and stellar, the researchers said, punching above its weight class. Meanwhile, the red dwarf is puny for its kind, with a mass just 13.4 percent of the Sun and a radius of 17.6 percent, [per *Phys.org*](). Red dwarfs *do* count as full-blown stars, and are believed to be the most common kind in the Milky Way. In short, both partners appear to be relative outliers respective to their categorizations, making this system fascinating in every way you look at it. ## Shrinking Feeling Though the stellar pair may as well be two peas in a pod now, the researchers suggest that both objects must have once been far larger. That means the orbits were much larger, too, and have since shrunk by a factor of five. The cause for this could be what's known as magnetic braking. When material breaks off from a star, it's captured by its powerful magnetic field and suspended at a great distance from the star's center. Let this play out countless times over millions of years, and the star begins to lose angular momentum, not unlike how sticking your legs out while spinning in a chair [slows you down](). The saddening implication is that these orbits will eventually shrink to the extent that likely only one star could prevail: the brown dwarf, which will gradually siphon material from the red dwarf due to its strong gravity. **More on stars:** *[Amazing Simulation Shows What’s Happening Inside Stars]()* ## Author At Futurism, my work has often centered on bringing a sense of clarity and insight to complex topics ranging from the regulation of emerging technologies to the esoteric ideologies of Silicon Valley executives, while striving not to lose the poetic sense of awe inspired by often-obscure fields like astrophysics and quantum computing. I broke the story of CNET using AI to produce articles that turned out to be riddled with factual errors and plagiarism — a dam-breaking inflection point, as I've reported, that's inspired copycats and endless discourse while beguiling stakeholders ranging from tech giants to purveyors of spam around the web. My work at Futurism has been cited by publications including CBS News, the Los Angeles Times, Vice, Gizmodo, Engadget, the Verge, and Vanity Fair. I grew up in locales ranging from India to China, and now live in the exotic suburbs of Virginia. In my free time, I'm an avid reader of weird sci-fi literature, an aficionado of East Asian cinema, and, regrettably, a relapsed gamer. Allegedly, I’m working on a debut novel, currently untitled. ### Author social links [Bluesky]()