Second alien moon identified is much like the first: big and strange

WASHINGTON : For only the second time, astronomers have detected what appears to be a moon orbiting a planet in another solar system. Just like the first time, this one has traits suggesting that such moons may differ greatly from those populating our solar system.

"We don't know the mass or indeed composition. It could be a rocky core with a light fluffy envelope or a thick atmosphere all the way down to some high-density core," said Columbia University astronomy professor David Kipping, lead author of the research published in the journal Nature Astronomy.Close to 5,000 planets beyond our solar system, or exoplanets, have been identified, compared to only two such moons, called exomoons.

The researchers employed the"transit method" often used to detect exoplanets. They observed a dip in the brightness of the sun-like star around which the moon's planet orbits when the planet and then the exomoon passed in front of it. The Kepler telescope obtained data on two such transits.

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