250 of the most intriguing astronomy milestones, including:
Big Bang (c. 13.7 Billion BCE) • Birth of the Sun (c. 4.6 Billion BCE) • Life on Earth (c. 3.8 Billion BCE)
Homo Sapiens (200,000 BCE) • Birth of Cosmology (c. 5000 BCE) • Egyptian Astronomy (c. 2500
BCE) • Greek Geocentrism (c. 400 BCE) • Ptolemy's Almagest (c. 150) • Early Arabic Astronomy (c.
825) • Mayan Astronomy (c. 1000) • Gregorian Calendar (1582) • Three Laws of Planetary Motion
(1619) • Speed of Light (1676) • Newton's Laws of Gravity and Motion (1687) • Celestial Navigation
(1757) - Meteorites Come from Space (1794) • Foucault's Pendulum (1851) • Radioactivity (1896) • Size of the Milky Way (1918) • Dark Matter (1933) • First Humans in Space (1961) • Quasars (1963) • First Mars Orbiters (1971) • Uranian Rings Discovered (1977) • Space Shuttle (1981) • Voyager 2 at Neptune
(1989) • Hubble Space Telescope (1990) : Asteroids Can Have Moons (1992) • Cassini Explores Saturn (2004) - Demotion of Pluto (2006) • Mars Science Laboratory Curiosity Rover (2012) • Earth's Oceans Evaporate (-1 Bilion) Last of the Stars (-104) • How Will the Universe End? (The End of Time)