Aristotle

1
Aristotle

• Year 347BC
• believed that the Earth was at the center of the
  universe.

2
Ptolemy

• Year 100AD
• He believed Earth was at the center of the
  universe and all other heavenly bodies revolved
  around it.
• This theory is known as the geocentric theory.

3
Nicolas Copernicus

• 1543
• All of the planets revolve around the sun.
• This theory is known as the heliocentric theory.

4
Galileo Galilei

• In 1609, Galileo used a telescope to look at the
  sky.
• He confirmed Copernicus theory that the planets
  revolved around the sun.

5
Sputnik

• first artificial satellite into space on Oct.4,
  1957.
• Launched by Soviet Union
• Sputnik orbited the Earth for 6 months before
  falling back to Earth.

6
Yuri Gagarin

• April 1961
• First person to go into space.
• He orbited the Earth one time.
• He was from the Soviet Union(Russia).

7
Alan Shepherd

• May 1961
• First American
• to go into space.
• Stayed in space for 15 minutes.

8
Space Race

• A race between United States and Soviet
  Union(Russia) to see who could go the farthest in
  space.
• "I believe this nation should commit itself to
  achieving the goal, before this decade is out, of
  landing a man on the moon and returning him
  safely to the Earth."
• He asked Congress for 22 billion dollars to
  finance the Apollo missions.

9
John Glenn

• February 20,1962
• The first man to orbit the Earth in space.
• Orbited 3 times around Earth
• Landed in Atlantic Ocean

10
Capsule returning to Earth
Rocket at launch pad
Capsule lands in ocean and is recovered by a Navy
ocean liner
Capsule in space
11
Gemini Program

• Mid 1960s (1965)
• Sent 2 people into space to work on techniques
  for a lunar mission.
• Space walks
• Spent up to 14 days in space

12
Apollo 11

• July 20, 1969
• 1st mission to land on the moon
• Neil Armstrong and Buzz Aldrin 1st to walk on the
  moon
• Michael Collins orbited the moon

13
Pictures from Apollo 11 mission
14
Space Shuttle

• First launch in 1981
• First reusable rocket
• Can carry a crew of 5-8 astronauts
• Put satellites into orbit and/or make repairs

15
Hubble Space Telescope

• Put into orbit in 1990
• Satellite that orbits Earth and takes pictures of
  other stars, galaxies, and planets

16
Mir

• Russian Space Station put into orbit in 1986
• U.S. and Russian astronauts lived and worked in
  space for months at a time
• Came crashing back to Earth in 2001

17
International Space Station

• Construction started in 1998
• Space station built by United States, Russia,
  Canada, Japan, and other countries
• Scientists live here and perform experiments

18
Rovers that have landed on Mars

• 1997 Pathfinder lands safely on Mars and
  releases rover Sojourner to study the surface.

2003 Spirit lands on Mars
19
Mariner satellites

• 1971
• Explored inner planets Mercury, Venus, and Mars

20
Voyager

• Launched from Earth in 1977
• Sent to study the outer planets Jupiter,
  Saturn, Uranus, Neptune
• Discovered Great Red Spot is a storm and Neptune
  has the strongest winds

21
Cassini

• Launched in 1997
• Reached Saturn in 2004
• Studying the rings and moons of Saturn