After Discovering 6,000 Exoplanets, Researchers May Have Found the First Exomoon
Researchers say the object has about 0.9 Jupiter masses and a 170-day orbit, but further observations are needed to confirm the signal.
- European Southern Observatory student Kevin Hoy identified a potential 'exosatellite' orbiting the brown dwarf CD-35 2722 in a study published in Nature, located around 72 light-years from our solar system.
- Brown dwarfs lack the hydrogen fusion to become stars, residing between planets and stars in mass; this brown dwarf is estimated at about 37 times Jupiter's mass, while the potential exosatellite has a minimum mass of about 0.9 Jupiter masses.
- Researchers used radial velocity analysis to observe tiny wobbles in the brown dwarf's orbit, indicating a companion; the moon-like object completes its orbit in roughly 170 days, though its exact inclination remains unknown.
- University of Cambridge astrophysics professor Roman Rafikov argued the object is not an exomoon, as the discovery sparked debate over terminology for objects orbiting brown dwarfs rather than stars.
- Despite finding approximately 6,000 exoplanets, astronomers have not yet confidently detected an exomoon; current International Astronomical Union classifications do not adequately define objects orbiting substellar companions, requiring further observation.
11 Articles
11 Articles
A strange object with a Jupiter-like mass has been discovered orbiting a brown dwarf at 72 light years. Scientists doubt whether to classify it as a planet, moon or a new type of exosatelite.
Astronomers Spot Jupiter-Mass Object Orbiting a Brown Dwarf, Prompting Fresh Debate Over Cosmic Labels
Astronomers have uncovered an object so peculiar that it defies easy categorization. The discovery, reported just days ago, centers on a body with roughly the mass of Jupiter. Yet it doesn’t circle a star in the familiar way. Instead, it orbits a brown dwarf. That brown dwarf, in turn, orbits a star known as CD-35 2722, located about 72 light-years from Earth. The finding comes from observations made with the European Southern Observatory’s Very…
The research surprised the scientific community because the object found does not fit current classifications. Find out what makes it so special and why it generates debate.
Scientists Discover Massive Alien "Exosatellite"
Scientists have discovered a puzzling object in a distant star system that defies classification. Hear us out. The object in question orbits a brown dwarf. A brown dwarf is a substellar type of object that larger than a gas giant but smaller than the smallest stars. And this brown dwarf, in turn, orbits the system’s main star. Since the newly-identified object doesn’t orbit a planet, it technically isn’t a “moon” by any normal definition, but it…
We assumed exomoons would be easy to find once we had the technology — but moons are small, dim, and hidden in the glare of their host, and it took until July 2026 and a radial-velocity wobble on a brown dwarf before astronomers had their first plausible detection
For years, exomoons felt like one of those astronomical discoveries that should arrive almost automatically once telescopes became sensitive enough. We had found thousands of planets around other stars. Our own Solar System contains more moons than planets. Surely the first moon beyond it was mostly a matter of waiting. I had absorbed that assumption without examining it closely. Then I read the paper behind the July 2026 report from the CD-35 2…
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