Last week s giant was the most unexpected discovery yet. Conventional theory suggests that it must have formed like a star, from a collapsing cloud of interstellar gas. Its smaller companion, only seven times Jupiter s mass, is almost certainly a planet, formed by the buildup of gas and dust left over from a star s formation. Yet the fact that these two orbs are so close together suggests to some theorists that they must have formed together--so maybe the bigger one is a planet after all.
Or maybe astronomers will have to rethink their definition of planet. Just because we put heavenly objects into categories doesn t mean the distinctions are necessarily valid. And as Tremaine puts it, When your classification schemes start breaking down, you know you re learning something exciting. This is wonderful stuff.
By Michael D. Lemonick Time; 01/22/2001, Vol. 157 Issue 3, p51, 2/3p, 1 diagram
1. The author believes that ____________.
[A] the discovery of planets is as important as the launch of space shuttles
[B] astronomers have been making a lot of discoveries of planets
[C] the public have no interest in astronomical discoveries
[D] there is little for astronomers to discover now
2.The two finds are remarkable in that ___________.
[A] the planets are far from our solar system
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