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450 BCE
The first person we know of to suggest that the Sun is a star up close was Anaxagoras.
STAR -
200 BCE
Aristarchus, a greek astronomer invented a model of the solar system in which the Sun was in the middle and the planets rotated around it.
SOLAR SYSTEM -
200
Hipparchus discovered the first nova, astronomers began to discover other types of stars from this.
STAR -
Johannes Kepler published "Astronomia Nova," which had his discovery of the first two laws of planetary motion, orbits.
ORBIT -
Galileo discovered the Galilean moons, writing a letter containing the first mention of Jupiter's moons
MOON -
Isaac Newton first published on gravity in "Principia Mathematica."
GRAVITY -
William Hershel discovered the Planet Uranus
PLANET -
John Couch Adams discovered Neptune
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Hubble Space Telescope was invented by Lyman Spitzer.
HUBBLE INVENTED -
Clyde Tombaugh discovered the planet Pluto
DISCOVERY OF PLUTO -
NASA (National Aeronautics and Space Administration)
The establishment of NASA was a sign that the United States was committed to winning the “space race” against the Soviets. -
Hubble Space Telescope's launch in 1990. Hubble is one of NASA's most successful and long-lasting science missions.
Hubble is a telescope that orbits Earth. Its position above the atmosphere, which distorts and blocks the light that reaches our planet, gives it a view of the universe that typically far surpasses that of ground-based telescopes.