Subcategories - Astronomy, Astronomers, Cosmology
- Sergei Korolev
- Shapley Proves the Sun Is Distant from the Center of Our Galaxy
- Shepard Is the First United States Astronaut in Space
- Shuttle Atlantis Docks with Space Station Mir
- Shuttle Endeavour Gathers Radar Images for Three-Dimensional Maps of Earth
- Simon Newcomb
- Skylab Inaugurates a New Era of Space Research
- Skylab Proves the Value of Earth Observation from Space
- Slipher Obtains the Spectrum of a Distant Galaxy
- Slipher Presents Evidence of Redshifts in Galactic Spectra
- Sosigenes
- The Soviet Luna 9 Makes the First Successful Lunar Soft Landing
- Soviet Union Launches Sputnik
- Soviet Union Puts a Human in Space
- Soviet Venera Spacecraft Transmit the First Pictures from the Surface of Venus
- The Soyuz 4 and 5 Spacecraft Dock in Orbit
- Spaceflights of Voyagers 1 and 2
- Spacelab 1 Is Launched Aboard the Space Shuttle
- The Steady-State Theory of the Universe Is Advanced by Bondi, Gold, and Hoyle
- Supernova 1987A Corroborates the Theories of Star Formation
- Tiros 1 Becomes the First Experimental Weather Reconnaissance Satellite
- Tombaugh Discovers Pluto
- Tsiolkovsky Proposes That Liquid Oxygen be Used for Space Travel
- Tully Discovers the Pisces-Cetus Supercluster Complex
- Tycho Brahe
- U.S. Scientists Report Discovery of Ice Crystals on Moon
- U.S. Spacecraft Mars Pathfinder Lands on Mars
- The United States Launches Its First Orbiting Satellite, Explorer 1
- Van Allen Discovers the Earth’s Radiation Belts
- Venera 3 Is the First Spacecraft to Impact on Another Planet
- Very Long Baseline Interferometry Is Developed
- Very Long Baseline Interferometry Is Developed for High-Resolution Astronomy and Geodesy
- Viktor A. Ambartsumian
- Von Weizsäcker Finalizes His Quantitative Theory of Planetary Formation
- Voyager 1 and 2 Explore the Planets
- Wernher von Braun
- Wheeler Names the Phenomenon “Black Holes”
- Yuri Gagarin
- Zwicky and Baade Propose Their Theory of Neutron Stars
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