(C)There are eight planets in our solar system(太阳系). Here is what you need to know about them.Mercury is the smallest planet in our solar system. It is the closest planet to the Sun. It is hot during the day. But it is different at night. It is frigid. The temperature(温度)...
The air has only 0.13% oxygen.It takes a spaceship about cight months to reach Mars from the earth when the two planets are the closest to each other, Scientists are still searching for more information about Mars.1. Mars looks like a blue and orange ball.2. Mars is the fourth planet ...
could be alone in the universe. The first reason Earth was able to become this welcoming blue sphere is because it's at just the right distance from the Sun, in a narrow zone not too hot and not too cold, where the temperatures are compatible with liquid water and life....
Despite the common saying "once in a blue moon," Blue Moons actually occur fairly regularly in astronomical terms. According to NASA, a Blue Moon happens approximately every two to three years. Since there are about 29.5 days between full moons, February will never have a monthly Blue Moon, ...
Despite its name,planetary nebulae isn't anything to do with planets. They get their name from the British astronomerWilliam Herschel, Sir, who, when he first saw a planetary nebula, thought it looked likeUranus. Planetary Nebulae are created when a star comes to the end of its life. When...
We know there's methane (甲烷) in the atmosphere, because that's what makes the planet such a pretty blue color. We also know there's hydrogen because of observations made by the Voyager 2 spacecraft when it flew past.But the concentration of other composition, such as water and hydrogen...
根据下文:people's skin won't be so white as before人们的皮肤不会像以前那么白,此处应该是:因为紫外线辐射在其他行星上比地球强,故选B.48.B考查形容词的辨析和语境的理解.A.blue蓝色的 B.white白色的 C.black黑色的 D.red红色的. 根据上文:because UV radiations are stronger on other planets than ...
While on the subject of scale, it is informative and sobering to consider the illustration below, as regards the overall water and freshwater proportion on Earth, the smaller of the two drops compared to the rocky Earth in the image.The freshwater on Earth’s surface is the smaller blue dot...
All other known planets with known moons do not exhibit this sort of agreement, so there does not appear to be any universal law of nature that would enforce this coincidence. (This is in contrast with the empirical fact that the Moon always presents the same side to the Earth, which ...