Mercury, Venus, Earth, Mars. Terrestrial, rocky : 11
The spinning of a planet on its axis, causing day and night :9
A force of attraction that keeps planets orbiting the sun : 7
A group of objects that orbit a star : 8
The orbit of a planet around the sun. On Earth, one year : 10
The idea of that the Earth and planets orbit the sun. A sun-centered view : 6
A rock that has entered Earth's atmosphere, leaving a streak of light in the night sky : 13
Jupiter, Saturn, Uranus, Neptune. Gas giants : 12
The theory the universe came forth from a single spot in an enormous explosion: 1
Huge clusters of stars, gas, and dust bound by the force of gravity: 8
<h3>What is Galaxy?</h3>
The group of many stars along with interstellar gases, rocks and dust material.
Thus, the numbers are added in front of the sentences.
Learn more about galaxy.
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