Progresss in astronomy
The 20th century has been a remarkable period for astronomers with no signs that they have stopped making fascinating new discoveries or that they have yet solve all of the universe many puzzles
Astronomers:
- Henry Norris Russel
showed that all the stars are going through a life cycle of birth, maturity and old age
- Harlow Shapley
used variable stars as yardstick to give the first good estimate of the enormous size of our own galaxy the "milky way"
- Edwin Powell Hubble
showed the some nebula's, faint and cloudy spots visible through telescope are actually extremely distant "island universe"
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