Hey, you've made day and night! When where you are is pointed toward the Sun, it is day. Then the Earth rotates you away from the Sun, and it is night. Think about this! So, how fast does …

The gibbous moon appears to grow fatter each night until we see the full sunlit face of the Moon. We call this phase the full moon. It rises almost exactly as the Sun sets and sets just as the …

At night, when that part of Earth is facing away from the Sun, space looks black because there is no nearby bright source of light, like the Sun, to be scattered. If you were on the Moon, which …

Objectives: Identify the Sun as the source of Earth's light. Observe and describe changes in the Sun's altitude and position. Recognize that day and night are determined by our view of the Sun.

Mercury is the smallest planet in our solar system. Mercury is about the same size as our Moon. It is very close to the Sun. Mercury travels around the Sun faster than any other planet. That is …

A rotation takes 243 Earth days, so a Venusian day is longer than a Venusian year. As with the other inner planets, the surface of Venus has been shaped by impact craters, tectonic activity, …

Moonlight Madness The of the Moon around the Earth causes the Moon to appear to change shape in the sky. These apparently different shapes are called "phases" of the Moon. The …

In the image above taken by Steven Alan in the United Kingdom near the times of the greatest and least separation between the Earth and Sun, it is clear the Sun is slightly larger in …

Venus gets so hot during the day that it could melt a lead cannonball. The temperature rises to 484 degrees Celsius on the side facing the Sun. Venus has very thick, rapidly spinning clouds …

Most people in Galileo's time believed that the Earth was the center of the universe and that the Sun and planets revolved around it. The Catholic Church, which was very powerful and …