Images from ground-based telescopes are invariably distorted by the Earth's atmosphere. Orbiting space telescopes, however, operating above Earth's atmosphere, should provide superbly detailed images. Therefore, ground-based telescopes will soon become obsolete for advanced astronomical research purposes.
Which of the following statements, if true, would cast the most doubt on the conclusion drawn above?
Images from ground-based telescopes are invariably distorted by the Earth's atmosphere. Orbiting space telescopes, however, operating above Earth's atmosphere, should provide superbly detailed images. Therefore, ground-based telescopes will soon become obsolete for advanced astronomical research purposes.
Which of the following statements, if true, would cast the most doubt on the conclusion drawn above?
(A) An orbiting space telescope due to be launched this year is far behind schedule and over budget, whereas the largest ground-based telescope was both within budget and on schedule.
(B) Ground-based telescopes located on mountain summits are not subject to the kinds of atmospheric distortion which, at low altitudes, make stars appear to twinkle.
(C) By careful choice of observatory location, it is possible for large-aperture telescopes to avoid most of the kind of wind turbulence that can distort image quality.
(D) When large-aperture telescopes are located at high altitudes near the equator, they permit the best Earth-based observations of the center of the Milky Way Galaxy, a prime target of astronomical research.
(E) Detailed spectral analyses, upon which astronomers rely for determining the chemical composition and evolutionary history of stars, require telescopes with more light-gathering capacity than space telescopes can provide.
p: 太空望远镜比地面望远镜拍摄更加清晰
C:地面望远镜在高级太空研究方面会过时淘汰
P和C之间有一个gap就是,清晰是高级太空研究的唯一标准,E给出了另一个标准就是light-gathering capacity
A 讲的是成本,无关
B和C 都专注于地面望远镜可以避免照片质量的下降,但是并没有说地面望远镜比太空望远镜好,(地面望眼镜被淘汰不是因为它不好,而是因为它没有太空望远镜好),所以并不能说明它不会被淘汰
D 说的是地面望远镜放在一个特殊的地点可以对银河系(太空研究的主要目标)进行最好地面观察,但是又没有说怎样是最好的观察,最多说明在这个地点进行所有的地面观测最好,没有说明地面观察之于太空观察的优势
E 补充了GAP,尽管没有直接说地面望远镜比太空望远镜好,但是说了太空望远镜的一个弱点