- America launched its first space station in 1973.
- Six of the eight planets of the solar system were known in the life time of Kepler, the formulator of laws of planetary motions.
- Mercury and Venus are the two planets of the solar system that have no satellites.
- The study of heavenly bodies is known as Astrophysics.
- MAKEMAKE is the second most massive known dwarf planet in the Solar System (after Eris) and the tenth-most massive body observed directly orbiting the Sun.
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