1. Sputnik II, first artificial satellite, was launched 3 November, 1957.
2. The first Western Scientist to suggest that the Earth revolved around the Sun was Copernicus.
3. Skylab was space laboratory launched in 1973. It belonged to USA.
4. In 1979 Sky Lab did break up in the atmosphere and fell back to the earth.
5. Black Hole is Hypothetical region in space.

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