Subcategories - Astronomy, Astronomers, Cosmology

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  1. Friedrich Wilhelm Bessel
  2. Full Crew Leaves Russian Space Station Mir
  3. Gagarin Becomes the First Human to Orbit Earth
  4. Galileo
  5. Galileo Confirms Heliocentric Model of the Solar System
  6. Galileo Makes Closest Pass to Jupiter’s Moon Europa
  7. Galileo Publishes Dialogue on the Two Chief Systems of the World
  8. Galileo Spacecraft Reaches Jupiter
  9. Gamow and Associates Develop the Big Bang Theory
  10. Georges Lemaître
  11. The Germans Use the V-1 Flying Bomb and the V-2 Goes into Production
  12. Giacconi and Associates Discover the First Known X-Ray Source Outside the Solar System
  13. Giordano Bruno
  14. Glenn Is the First American to Orbit Earth
  15. Goddard Launches the First Liquid Fuel Propelled Rocket
  16. Greek Philosophers Formulate Theories of the Cosmos
  17. Hale Constructs the Largest Telescope of the Time
  18. Hale Discovers Strong Magnetic Fields in Sunspots
  19. Hale Establishes Mount Wilson Observatory
  20. Hale Oversees the Installation of the Hooker Telescope on Mount Wilson
  21. Hale-Bopp Comet’s Appearance Prompts Scientific and Spiritual Responses
  22. Harold C. Urey
  23. Hartmann Discovers the First Evidence of Interstellar Matter
  24. Heraclitus of Ephesus
  25. Hermann Oberth
  26. Hertzsprung Describes Giant and Dwarf Stellar Divisions
  27. Hertzsprung Notes the Relationship Between Color and Luminosity of Stars
  28. Hertzsprung Uses Cepheid Variables to Calculate the Distances to Stars
  29. Hess Discovers Cosmic Rays Through High-Altitude Ionizations
  30. Hipparchus
  31. Hubble Confirms the Expanding Universe
  32. Hubble Demonstrates That Other Galaxies Are Independent Systems
  33. Hubble Determines the Distance to the Andromeda Nebula
  34. Hubble Space Telescope Transmits Images to Earth
  35. Hypatia
  36. International Space Station Welcomes First Crew
  37. Jan Hendrik Oort
  38. Jansky’s Experiments Lead to the Founding of Radio Astronomy
  39. The Jodrell Bank Radio Telescope Is Completed
  40. Johannes de Muris
  41. Johannes Kepler
  42. Kapteyn Discovers Two Star Streams in the Galaxy
  43. Karl Schwarzschild
  44. Kennelly and Heaviside Propose the Existence of the Ionosphere
  45. Kibble Proposes the Theory of Cosmic Strings
  46. Konstantin Tsiolkovsky
  47. Kuiper Discovers That Titan Has an Atmosphere
  48. Launching of the First Liquid-Fueled Rocket
  49. Leavitt’s Study of Variable Stars Unlocks Galactic Distances
  50. Lemaître Proposes the Big Bang Theory
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