Astronomers, however, are still hunting for another possible planet in our solar system,a true ninth planet, after mathematical evidence of its existence was revealed on Jan. 20, 2016. The alleged "Planet Nine," also called "Planet X," is believed to be about 10 times the mass of Earth ...
英语翻译太阳系(Solar System)是以太阳为中心,和所有受到太阳引力约束的天体的集合体:8颗行星、至少165颗已知的卫星、3颗已经辨认出来的矮行星(冥王星和他的卫星)和数以亿计的太阳系小天体.这些小天体包括小行星、柯伊伯带的天体、彗星和星际尘埃.广义上,太阳系的领域
But that restrictive definition helped isolate what should and should not be considered a planet — a problem that arose as astronomers discovered more and more planet-like objects in the solar system. Pluto was among the bodies that didn't make the cut and was re-classified as a dwarf plane...
There are eight planets in our Solar System that orbit around the Sun. In order, going from the closest planet to the Sun, to the one that is farthest away, they are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. All of the planets and the Sun are round, like ...
This is one theory as to why the gas giants became so large, and why there is a divide in planet size between the small inner rocky planets and the outer gas giants.As time continued, the workings of gravity and the solar wind eventually resulted in the solar system becoming as we know...
The planets, in order of their distance from the Sun, are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. Under the control of the Sun's gravitational force, each planet maintains an elliptical orbit and all of them travel in the same direction....
以lack of gases and ices做关键词定位至倒数第二句，这句话只是单纯说现象，最后一句才是解释，而且这句话刚才已经讲过，说由于距离太阳近，类地行星最终失去了这些气态物质，所以答案是A。其余答案均与本段首句说反。
solar system The planets (in comparative size) in order of distance from the Sun. Encyclopædia Britannica, Inc. orbits The orbits of the planets and other bodies of the solar system. Encyclopædia Britannica, Inc. solar system to scale The eight planets of the solar system and Plut...
Uranus is also the only planet in the solar system to rotate on its side and, like Venus, rotates on its axis clockwise, with all the other planets rotating counterclockwise. Here are some more fun facts about the solar system planets presented in order of their distance from the sun. What...
Evidence of controversial Planet 9 uncovered in sky surveys taken 23 years apart Related:Solar System Planets: Order of the 8 (or 9) Planets Kepler’s laws would shift the star from the center of this model slightly to a focal point instead, flattening the orbits of planets, and suggest th...