The planets go around a dwarf star (矮星) called Trappist-1. It is much smaller and cooler than our Sun. They are about 40 light-years (光年) from the Earth. 27.___But scientists say it's a little close."28.___If you lived on one of them, you could possibly see the clouds...
A. Earth is a star. B. Planets don't move. C. Earth moves around the moon. D. Earth moves around the sun. 相关知识点: 试题来源: 解析 D。A 选项“地球是一颗恒星”错误。B 选项“行星不移动”错误。C 选项“地球围绕月亮转”错误。只有 D 选项正确地表达了文中内容。反馈...
If AU Mic's planets were as massive as Jupiter, however, they should have been visible directly, since very massive planets around such a young star would still retain a lot of heat from their formation. "We don't see any such massive planets, so whatever bodies are shaping the dust mus...
Gravitational microlensing occurs when light from a source star is bent and focused by gravity as a second object (the lens star), which passes between the source star and an observer on Earth. A planet rotating around the lens star will produce an additional deviation in the microlensing. T...
Based on the large number of elliptical planetary nebulae I argue that about 55 per cent of all progenitors of planetary nebulae have planets around them. The planets spin up the stars when the later evolve along the red giant branch or along the asymptotic giant branch. The arguments, which...
The first is a pair of planets, each about the mass of Jupiter, that whirl around their home star 15 light years from Earth in perfect lockstep. One takes 30 days to complete an orbit, the other exactly twice as long. Nobody has ever seen such a configuration. But the second discovery...
A number of the planets seem to be completely solid (坚硬的) and made of rocks. But astronomers have found one that is covered with water. While planets are interesting, there is 9 reason why astronomers are looking for them—they want to find a planet like the earth. Such planets, ...
we understand that planets form by the gathering together of gas and dust particles in orbit around a newly created star. Each dust particle is heated by the young protostar and radiates in the infrared region of the spectrum. Before any planets form, we can detect such radiation from all of...
This is an artist's impression of a protoplanetary disk. Newly formed planets can be seen traveling around the central host star, sweeping their orbits clear of dust and gas. These same ring-link structures were observed recently by ALMA around the young star HL Tau. There are two planets ...
美[ˈplænɪt] 英['plænɪt] n.【天】行星;【占星】(左右人命运的)星相 网络八大行星;行星和太空之旅;九大行星 复数:planets 搭配 反义词 英汉 英英 网络释义 n. 1. 【天】行星 2. 【占星】(左右人命运的)星相 例句