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Astronomical Discoveries by Decade

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1900s

Discovery of Pluto

1910s

Einstein’s Theory of General Relativity is published.

2000s

Evidence for dark energy from Type Ia supernovae.

2010s

First picture of a black hole taken by Event Horizon Telescope.

1920s

Edwin Hubble's discovery that the universe is expanding.

1930s

Discovery of the first radio waves from space by Karl Jansky.

1940s

V-2 rockets take the first pictures of Earth from space.

1950s

Launch of Sputnik 1, the first artificial satellite.

1960s

First humans land on the Moon.

1970s

Viking 1 lands on Mars.

1980s

Discovery of the first known extrasolar planets.

1990s

Launch of the Hubble Space Telescope.

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