Subcategories - Astronomy, Astronomers, Cosmology

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  1. Lowell Predicts the Existence of Pluto
  2. Luna 2 Becomes the First Man-Made Object to Impact on the Moon
  3. Luna 3 Provides the First Views of the Far Side of the Moon
  4. The Lunar Orbiter 1 Sends Photographs of the Moon’s Surface
  5. Lunokhod 1 Lands on the Moon
  6. Mariner 10 Is the First Mission to Use Gravitational Pull of One Planet to Help It Reach Another
  7. Mariner 2 Becomes the First Spacecraft to Study Venus
  8. Mariner 9 Is the First Known Spacecraft to Orbit Another Planet
  9. Mars 2 Is the First Spacecraft to Impact on Mars
  10. Mars-Orbiting Craft Is Destroyed
  11. Mathematician and Philosopher Hypatia Is Killed in Alexandria
  12. Max Wolf
  13. Meteorite Is First Extraterrestrial Object Found to Contain Water
  14. Michelson Measures the Diameter of a Star
  15. Millikan Names Cosmic Rays and Investigates Their Absorption
  16. Nabu-rimanni
  17. NASA Announces Possibility of Life on Mars
  18. NASA Launches the Hubble Space Telescope
  19. NEAR Is First Satellite to Orbit an Asteroid
  20. Neil Armstrong
  21. Newton Formulates His Theory of Universal Gravitation
  22. Nicolaus Copernicus
  23. Nine Extrasolar Planets Are Found
  24. The Oldest Known Galaxy Is Discovered
  25. Oort and Associates Construct a Map of the Milky Way
  26. Oort Postulates the Existence of the Oort Cloud
  27. Oort Proves the Spiral Structure of the Milky Way
  28. Oppenheimer Calculates the Nature of Black Holes
  29. The Orbital Rendezvous of Gemini 6 And 7 Succeeds
  30. Organic Molecules Are Discovered in Comet Kohoutek
  31. Parker Predicts the Existence of the Solar Wind
  32. Penzias and Wilson Discover Cosmic Microwave Background Radiation
  33. Pierre-Simon Laplace
  34. Pluto Is Found to Possess a Thin Atmosphere
  35. Ptolemy (astronomer)
  36. Pythagoras
  37. Radioactive Satellite Fragments Land in Canada
  38. Reber Builds the First Intentional Radio Telescope
  39. Reber Makes the First Radio Maps of the Universe
  40. Ride Becomes First American Woman in Space
  41. Robert H. Goddard
  42. Russell Announces His Theory of Stellar Evolution
  43. Ryle Constructs the First Radio Interferometer
  44. Ryle’s Radio Telescope Locates the First Known Radio Galaxy
  45. Samuel Pierpont Langley
  46. Saturn 5 Booster Rocket Is Tested at Cape Kennedy
  47. Schmidt Invents the Corrector for the Schmidt Camera and Telescope
  48. Schmidt Makes What Constitutes the First Recognition of a Quasar
  49. Schwarzschild Develops a Solution to the Equations of General Relativity
  50. Scientists Find Strong Evidence for “Big Bang”
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