1. The first artificial satellite was launched in October 4, 1957.
2. America launched its first space station in 1973.
3. Six of the eight planets of the solar system were known in the life time of Kepler, the formulator of laws of planetary motions.
4. Mercury and Venus are the two planets of the solar system that have no satellites.
5. The study of heavenly bodies is known as Astrophysics.

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