28 000 B.C, Cro-Magnon people sketch moon phases on tools made out of bones, 4236 B.C, Egyptiens adopt a 365-day calendar based on the movement of the star Sirius, A.D 900s, Arab astronomers improve the accuracy of the Greek astrolabe, a tool for celestial navigation., 1054, Chinese astronomers document the explosion of the supernova that creates the Crab Nebula, 1608, The telescope is invented, allowing astronomers to discover planets such as Uranus and Neptune, moons, and stars that are invisible to the naked eye., 1860, The invention of spectroscopy suggests that the celestial bodies are composed of some of the same elements that make up Earth's atmosphere, 1957, Russia launches the first two satellites into orbit around Earth, marking it the beginning of space exploration., 1990, The United States astronauts become the first humans to walk on the moon., 2004, A Mars rover discovers rock formations and sulfate salts indicating the planet once had flowing water.
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Astronomy Timelines
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Tessacharlie12
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