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100
Aristotle
Actuall dates are 384 BC - 322 BC. He believed in the geocentric theory and thought the universe was perfect. -
Period: 101 to
Ptolemy
The specific dates are not accurate. The years were 90 AD - 168 AD. Ptolemy believed in the geocentric theory, his theory was accepted for centuries. -
Period: Feb 19, 1473 to May 24, 1543
NIcolaus Copernicus
He was the first person to tell others about his heliocentric theory based on the movements of the planets. -
Period: Feb 15, 1564 to
Galileo Galilei
He too supported the heliocentric theory and created a new telescope. -
Period: to
Isaac Newton
He is best known for his theory on universal gravitation. -
Sputnik 1 Launches
Sputnik 1 was the first man made object to orbit Earth. With the launch of Sputnik the space race began. This was an orbital mission. Sputnik 1 was also an artificial satilite. -
Explorer 1 launches
This bullet shaped satelite broke the record for altitude of Sputnik 1 and 2, It was an orbital mission. -
NASA created
After Sputnik was launched, President Eisenhour created the space company NASA. -
First human in space
Yuri Gagorin was the first human in space. -
First women in space
Valentina Tereshkova was the first women to go to space. -
First person to walk in space
Aleksi Leonuave was the first person to walk in space. -
Apollo 11
Niel Armstrong was the first man to walk on the moon with the help of Edwin E "Buzz" Aldrin. This was a mission to the moon, Apollo 11 was the rocket. -
First US space station launches
First US space station launches. -
Viking 1
The Viking 1 explores Mars surface. The Viking 1 was a mars robotic explorer. -
Voyager 1
Voyager 1 was launched on September 5, 1977. It passed the outer planets Jupiter and Saturn. It continued out of our solar system and is now approximatly 100 times as far from the Sun as the Earth is. -
SpaceX
A private company named SpaceX sent out a rocket into orbit and brought it back to Earth safely. It was the first time a non-goverment organization was able to accomplish this.
