1543-04-26 03:53:35

Copernicus Writes a Book

Copernicus published an idea about a new idea he had-that the Earth is not the center of the universe

1600-04-01 00:00:00

Orbit of Planets Discovered By Kepler

1604-04-01 00:00:00

First Supernova Seen

1609-04-07 05:26:36

Galileo Discovers the Solar System

1687-04-01 00:00:00

Gravity With Sir Isaac Newton

1920-04-01 00:00:00

Milky Way Galaxy Named

1930-04-01 00:00:00

Pluto Discovered

1958-04-01 00:00:00

NASA Founded

2006-04-01 00:00:00

Pluto Was Declassified as a Planet

2015-04-01 00:00:00

First earth sized planet discovered in habitable zone

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2016-04-01 03:53:35

Planet 9

Scientists say they discovered a new planet in our solar system that can be 10x bigger than the Earth.