Thirteen crucial benchmarks in the history of what may be the oldest science:
-Ancient awareness that the planets move -Copernican cosmology -Johannes Kepler's laws of planetary motion -Galileo's discovery of Jupiter's moons -Edmund Halley's comet prediction -William and Carolyn Herschel's galactic mapping -Einstein's General Theory of Relativity -Edwin Hubble's proof that the universe is expanding -Karl Jansky's discovery of galactic radio waves -Arno Penzias and Robert Wilson's detection of the cosmic microwave background -Observations of gamma ray bursts -The discovery of extrasolar planets -The "big rip" theory
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