Article: Scientists discover 18 planet-sized objects unattached to mother stars.(Knight Ridder Newspapers)

WASHINGTON _ Astronomers have discovered a nursery of 18 young, planet-sized objects unattached to any mother stars, wandering through space like orphans.

This new class of creatures in the celestial zoo is challenging current theories on the formation of stars and planets.

"If these observations are confirmed, this means we're really going to have to rewrite the textbooks on how planets form," said Ronald Greeley, a planetary scientist at Arizona State University in Tempe. "This opens a whole new realm of objects in the universe."

The mystery objects are dim red balls of gas, estimated to be five to 12 times more massive than Jupiter, the ...

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