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Astronomers who study planet formation once believed that comets—because they remain mostly in the distant oort cloud, where temperatures are close to absolute zero—must be pristine relics of the material that formed the outer planets. They are called hot jupiters because each is similar in mass to jupiter, the largest solar-system planet, but orbits its parent star at a fraction of the distance at which earth, let alone jupiter, orbits the sun. Instead, three separate projects with common goals are fighting one another for funding. Astronomers have had difficulty accounting for certain planets discovered outside our solar system. The meteorite monahans 1998 is an ordinary chondrite, a class of meteorites that astronomers have believed contain little or no water. 【gre真题答案解析】gre考满分为考生准备gre 填空和等价tc真题答案解析，we might be much closer to building the next generation of observatories if competing groups of astronomers had not ____________ repeated chances to collaborate; The water could have come from a water. The water is presumed to be of the same vintage-the first time that water of primordial origin has been detected. But monahans 1998 contains water locked inside salt crystals that date from the solar systems formation. In the standard, solar-system-based theory of planetary formation, such as a. Astronomers who study planet formation once believed that comets–because they remain mostly in the distant oort cloud, where temperatures are close to absolute zero-must be pristine relics of the material that formed the outer planets.
