在天文学上,star指的是“恒星”。太阳系(solar system)只有一个star(恒星),会发光、发热,那就是太阳。 Planets(行星) 金星则是 planet(行星),不发光,也不发热,在轨道上环绕太阳运行(orbit)。 ORBIT:To move in a path around another object, such as ...
Our local neighborhood in space is called the solar system. At its heart is the Sun, an ordinary star that is so close it floods our planet with light. Trapped in its orbit by gravity are Earth and seven other planets, their many moons, and millions of comets and asteroids. Sun The su...
lie in the area surrounding the solar system, in the far reaches of the swarm of comets known as the Oort cloud or in the disk of debris known as the Kuiper belt. All of these objects travel around the sun at high speeds in paths called orbits. Some of these orbits, like those of ...
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 ...
planets have moons that orbit them in the same way that ourMoon orbits the Earth.Asteroids(小行星)were formed(构成)along with the restof the Solar System around 5,000 million years ago.They orbit theSun like the planets.方练有所得——学习能力构建1.How many planets are there orbiting the...
Solar system, assemblage consisting of the Sun and those bodies orbiting it: 8 planets with about 210 known planetary satellites; many asteroids, some with their own satellites; comets and other icy bodies; and vast reaches of highly tenuous gas and dust
The dwarf planetCeres, about 590 miles (950 km) in diameter, resides here. A number of asteroids have orbits that take them closer into the solar system that sometimes lead them to collide with Earth or the other inner planets. Jupiter: The largest planet in our solar system ...
Saturn, distinguished by itsextensive ring system, has several similarities to Jupiter, such as itsatmosphericcompositionandmagnetosphere. Although Saturn has 60% of Jupiter's volume, it is less than a third as massive. Saturn is the only planet of the Solar System that isless dense than water...
There are several planets in our solar system that can be seen with the naked eye, but many that cannot be viewed without a telescoping lens. Learn about the orbits of the five naked-eye planets and also why they can be seen without technological assistance. ...
The planet is sixth planet from the sun and named after the Roman god of agriculture. Uranus Uranus is the second furthest planet from the Sun. The planet orbits on its side and has 27 moons. Uranus is the fourth largest planet and an ice giant. ...