Lots of stuff about space eg Star classifications, Milky way is one galaxy,Theory of big bang 1927
1943: Proves Dna makes chromosomes
1969: Man lands on the moon
1957: Sputnik is launched. First object humans got into orbit around earth
1930: Pluto is discovered
Structure of DNA confirmed and proved in 1953
1923: Man treats patient with heart defect
1923: First liquid rocket fuel was created meaning it is now possible for humans to escape earths gravity