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Rhett Allain
结果1 题目 A The earth is the only planet () that scientists think has life. Why does the earth have life while the other planets don't? For one thing, the earth has just the right temperature. As the third planet from the sun, the earth seems to be just the right distance away...
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When people on the opposite side of the Earth face the Sun,those people have day when we have night.The Moon is a different story. It doesn't make its own light. Moonlight is really the Sun's light reflecting(反射) the Moon back to us. The Sun lights up only the side of the ...
Why can't the largest moon crater be seen from Earth? What can you see on the moon from Earth? Why don't observers on Earth ever see the back side of the moon? Why does the moon appear red during a lunar eclipse? Why does the moon have more craters than Earth?
Does the sun exert a gravitational force on the earth? if so, why doesn't the earth fall into the sun? The gravitational force on the Moon due to the earth is only about one half the force on the Moon due to the sun. Why isn't the Moon pulled away from the Earth? Give an exam...
Whydoestheearthhavefourseasons,whilethemoondoesnot?Theansweris ---weather.Clouds,winds,rainsands___---thesearealls___ ofweather.Theyareapartoftheweatherpicture.Threethingsmakethesesignsofweather.Whenyouk___ whattheyare,youwillalwaysseethemineverykindofweather.Withoutthemyouwouldhavenoweather.Thefirstthing...
The sky appears red during sunsets on Earth due mostly to the fact that the sunlight travels through more atmosphere to reach our eyes. By the time the light arrives, it's been stripped of shorter wavelengths, which have scattered away, leaving only the longer-wavelength, direct illumination ...