The Quiz Of Astronomy

The correct answer is "Sun." The question is asking for the name of the star in our Solar System, and the word "Sun" is the correct name for our star. The variations "The sun," "sun," and "the sun" are also acceptable as they all refer to the same star.

Astronomers believe that Mars once had water on its surface because of various pieces of evidence. The presence of dried-up riverbeds, polar ice caps, and minerals that can only form in the presence of water all suggest that Mars had liquid water in the past. Additionally, recent discoveries of underground ice reserves and the detection of water vapor in the atmosphere further support the idea that Mars had a watery environment in its earlier history.

Gravity is the force that holds water on Earth. Gravity is the natural phenomenon by which objects with mass are brought towards each other. On Earth, gravity pulls everything towards the center of the planet, including water. This force keeps water from floating away into space and causes it to be held within the Earth's atmosphere and bodies of water such as oceans, lakes, and rivers.

The Milky Way is classified as a spiral galaxy. Spiral galaxies are characterized by their spiral arms that extend outwards from a central bulge. The Milky Way has a central bulge and arms that contain a mix of young and old stars, as well as gas and dust. This classification is based on observations of the structure and characteristics of the Milky Way, such as its shape and the presence of spiral arms.

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