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Nicolaus Copernicus publishes a book called "On the Revolutions of Heavenly Spheres" and the book was about how the planets orbited the sun.
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Galileo used a telescope to view the stars and planets for the first time.
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Issac Newton publishes a book called " Mathematical Principles of Natural Philosophy", and it was about the foundation of the universal gravitation of the sun and planets.
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Ceres was the first astroid and it was discovered by Giuseppe Piazzi.
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Robert Goddard invented and launched the first liquid rocket.
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The German V-2 rocket is the first rocket to enter space
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Russia launches a satellite called Sputnik 1 which causes the Space War between the U.S and U.S.S.R
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Russia sends the first animal into orbit and it is a dog.
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Yuri Gagarin became the first human in space.
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John Glenn is the first American to orbit Earth.
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The first person to walk in space is a Russian cosmonaut named Alexei Leonov.
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The Apollo 11 spacecraft landed on the moon, and Neil Armstrong became the first person to walk on it.
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Russia launches the first space station, and it's called Salyut 1.
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Viking 1 lands on Mars, and it sends information and pictures to help the U.S with research for the next 6 years
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The first space shuttle is launched to space, and it is called the "Colombia".
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The Mir space station is launched and remains active until 2001. It also inhabited astronauts, and orbited the Earth.
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The International Space Station is put into space and remains active till today.
