Last weeks 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 Jupiters mass, is almost certainly a planet, formed by the buildup of gas and dust left over from a stars 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 doesnt mean the distinctions are necessarily valid. And as Tremaine puts it, When your classification schemes start breaking down, you know youre learning something exciting. This is wonderful stuff.
By Michael D. Lemonick Time; 01/22/2001, Vol. 157 Issue 3, p51, 2/3p, 1 diagram
注(1):本文选自Time; 01/22/2001, p51;
注(2):本文习题命题模仿对象:第1题模仿1998年text5第1题;第2题模仿text4第2题;第3题模仿1993年text2第1题;第4题模仿1999年text1第3题;第5题模仿1997年text4第4题;
1. The author believes that ____________.
the discovery of planets is as important as the launch of space shuttles
astronomers have been making a lot of discoveries of planets
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