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An artist's conception of an exomoon around the planet Kepler 1625b. Could this big moon have its own submoon?
Astronomers say they've zeroed in on what could be the first moon seen orbiting a planet in another star system. The potential "exomoon" is the size of Neptune and is circling a Jupiter-size gas giant called Kepler 1625b.
Satellite - Kepler - Dozens - Moons - Solar
If there is such a massive satellite around Kepler 1625b, it'd be far larger than any of the dozens of moons in our own solar system, leading one researcher to consider whether the exomoon could host a moon of its own.
"This exomoon would be sufficiently large to stably host its own satellite," Duncan Forgan, a postdoctoral research fellow at the University of St Andrews in Scotland, writes in research notes of the AAS (American Astronomical Society). "This has sparked discussion of a new category of celestial object -- a moon-moon or submoon."
Forgan - Climate - Moon-moon - Kepler-1625 - System
Forgan modeled the climate of such a hypothetical "moon-moon" and found that if one exists in the Kepler-1625 system it might even be livable, with temperatures on the surface ranging between 44 and 152 degrees Fahrenheit (7 and 67 Celsius).
"If large exomoons are found in the universe, this raises not only the prospect of...
(Excerpt) Read more at: CNET
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