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A newly discovered planet in a binary star system located 3,000 light-years from Earth is expanding astronomers’ notions of where Earth-like—and even potentially habitable—planets can form, and how to find them.

At twice the mass of Earth, the planet orbits one of the stars in the binary system at almost exactly the same distance from which Earth orbits the sun. However, because the planet’s host star is much dimmer than the sun, the planet is much colder than the Earth—a little colder, in fact, than Jupiter’s icy moon Europa.

Four international research teams, led by professor Andrew Gould of The Ohio State University, published their discovery in the July 4 issue of the journal Science.
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The Earth may once have had two moons. If so, what happened to the other one?

There’s another theory that says we may STILL have two suns (NOTE: Subscribers can still listen to this show).

NASA’s GRAIL mission launched a lunar probe in 2011 to try to find remnants of a second moon, buried beneath the surface of the moon we see at night.
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