百度试题 结果1 题目2. How many planets(行星) are similar to the earth? 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
1II. 阅读理解Passage 1 [2021·原创]When we talk about how the Earth and the other planets travel around the sun, we say they orbit the sun.Likewise, the moon orbits the Earth. Many artificial satellites(人造卫星)also orbit the Earth.Satellites can orbit the Earth's equator(赤道) or go...
How many more years will Earth survive? Scientists suggest that in about 7.5 billion years, the sun will use up its hydrogen and switch to helium, which will turn it into an even bigger ball of hot gas. It will burn up both Mars and Earth, notes NBC MACH. How old is the Earth in...
I like to useStellariumbecause it’s easy to understand and free. Simply enter the coordinates for your location on Earth to generate a “live” look at the current position of the stars and planets in your night sky. To make it easier to locate the planets visible to you, adjust the l...
Earth-Like Planets: How Will We Know If They Can Sustain Life? (VIDEO)The Kepler spacecraft has made two landmark discoveries of Earth- like planets this month. But determining whether such planets can sustain life would require years of additional study.Spotts, Pete...
, ultraviolet and infrared views of our changing planet. A smaller number of satellites turn their "eyes" toward space, where they capture magnificent vistas of stars, planets and galaxies and scan for objects, such asasteroidsor comets, that could be heading for a collision course with Earth....
There are many kinds of clouds. Clouds are an important part of Earth's weather.How Do Clouds Form?The sky can be full of water. But most of the time you can't see the water. The drops of water are too small to see. They have turned into a gas called water vapor. 1 The cooler...
In October 1957, the Soviets finally proved Newton correct when they launched Sputnik 1 -- the first artificial satellite to orbit Earth. This kick-started thespace raceand initiated a long-term love affair with objects designed to travel in circular paths around our planet or other planets in...
Are there northern lights on other planets? Yes! Auroras aren't unique to Earth. They also appear on other planets with magnetic fields and atmospheres. For example: Jupiterhas the most powerful auroras in thesolar system, driven not only by thesolar windbut also by its volcanic moonIo. ...
their surfaces from damaging particles, or moons to stabilize their rotation. In short, there are lots of things that make Earth such a special planet, and we do not know enough about planets around other stars to confidently say how many planets like ours there are out there in thegalaxy....