The combination of recent results for the formation rate of Earth-like planets with our estimations of extrasolar habitable zones allows us to determine the number of habitable planets in the Milky Way over cosmological time scales. We find that there was a maximum number of habitable planets ...
根据下文“However, in 2015 NASA’s Kepler space telescope found its first Earth-sized planet in a “habitable” zone. ”(然而,2015年美国航天总局的开普勒太空望远镜在一个“宜居”区域发现了第一颗地球大小的行星)可推知,大多数系外行星和太阳系的行星不同。B. Most exoplanets are very different from...
1 However, we have developed the technology to prove their existence only in the last few decades. In 2015 NASA's Kepler space telescope found its first Earth﹣sized planet in a "habitable"(宜居的)zone. This is the distance from a star where surface temperatures of a planet wouldn't be ...
we have learned a great deal since Drake first proposed his famous equation about the first four variables. Much of this is due to the recent spate of exoplanet discoveries, which have given astronomers a good idea of how many stars have planets, and how often...
The combination of recent results for the formation rate of Earth-like planets with our estimations of extrasolar habitable zones allows us to determine the number of habitable planets in the Milky Way over cosmological time scales. We find that there was a maximum number of habitable ...
承接自然,上下文构成明显的转折关系,选项中的 only in the last few decades对应上文的has long been discussed,此外existence是关键词。故选E。【小题2】根据下文“However, in 2015 NASA’s Kepler space telescope found its first Earth-sized planet in a “habitable” zone. ”(然而,2015年美国航天总局的...