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( From 13 - 20 billion years ago)This theory states that, in the beginning, the universe was all in one place. All of its matter and energy were squished into an infinitely small point, a singularity. The laws of physics which applied at that instant are not understood at all. Something unknown caused the universe to explode, and thus began the expansion that we see today.
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First solar-lunar calendars
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Hubble shows that galaxies exist outside the Milky Way galaxy
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The discovery of Uranus by Hershcel
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The first reflecting telescope was built by Newton
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Martian polar ice caps are noted by Cassini
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Copernicus publishes his heliocentric theory of the universe
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Tycho Brahe discovers a supernova in constellation of Cassiopeia
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Galileo uses telescope for astronomical purposes. He discovers 4 Jovian moons, the Moon's craters and the Milky Way galaxy.
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Robert Goddard uses first liquid rocket fuel
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Sputnik, first object to orbit the Earth, launched by the Russians.
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Explorer 1 launched. This was the first U.S. satellite to orbit the Earth.
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Galileo discovers origin of Jupiter's Rings.
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NASA loses the Mars Climate Orbiter and the Mars Polar Lander.
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Space Shuttle Endeavor makes a detailed, global map of Earth
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New evidence found for water on Mars.
