A. Fill in the blanks. theory. galaxy. direction. 1. The origin of the universe is probably due to the 2. The Solar System belongs to the 3. All the planets revolve around the Sun in the 4. The equatorial diameter of the Earth is about 5. The speed of light coming from the Sun is km. km per second.
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1 : big bang(i think)
2: Milky way Galaxy.
3: orbit.
4: 12,742 km
5:300,000.
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