PROGRESS IN ASTRONOMY

The 20th century has been a remarkable perid astronomers with no signs that they have stopped fascinating new discoveries .

ASTRONOMERS

1. Henry noriss Russel- thought that all stars are going trough life cycle of birth.
2. Harlow Shapley-used variable stars as a yardsticks
3. Edwin Powell Huble- showed the same nebulars faint cloudy spot
4. Hans Bethe- proposed the existence of series of nuclear reaction

Radio astronomy- new field of science

radio signals- received from distant stars

radio waves- type of electromagnetic reaction

spectroscope- revealed the nature of gasses existing in the sun.