Some Young Planets
May Be Mirages
by Ken
Croswell
Planets
emit no light of their own, so observers hunting for worlds
orbiting other stars usually detect them indirectly. Now, one such
technique has come under fire. The gravity of a planet circling a
star in a dusty disk can carve gaps in the disk. But as researchers
report online today in |
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原著:Ken Croswell
青春就应该这样绽放 游戏测试:三国时期谁是你最好的兄弟!! 你不得不信的星座秘密