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Loading contentHow humanity came to understand the universe — from the first sky-watchers to the age of gravitational waves. Each lesson connects to real astronomers, discoveries, and eras in the knowledge graph.
Galileo Galilei was an Italian astronomer and physicist who pioneered telescopic astronomy, discovering the four largest moons of Jupiter.
Edwin Hubble was an American astronomer whose observations established that the universe is expanding and that galaxies lie far beyond the Milky Way.
On 14 September 2015 the LIGO observatories recorded a ripple in spacetime from two merging black holes 1.3 billion light-years away — the first direct detection of gravitational waves.
In little more than a century, astronomy was remade. The telescope opened the sky, Kepler found that planets move in ellipses, Galileo turned observation into evidence, and Newton's universal gravitation united the heavens and the Earth…