Gravity and Space

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Gravity and Space
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Gravity
Gravity is an attractive force that affects
anything with mass
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Gravity
Gravity depends on 2 things
1) The mass of the objects
2) The distance between them
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Gravity and our Solar System

• The Suns gravity is what holds our solar system
  together.

• Since Jupiter is the largest planet, it has the
  most gravity.
• Pluto has the least amount of gravity of all the
  planets

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27/12/2015
Gravity and our Solar System

• What do you think would happen to the planets if
  the suns gravitational pull suddenly disappeared?

To get an explanation WATCH THIS!

• GRAVITY its what holds our Solar System
  together!

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Now lets learn about

• An overview of the
• Solar System

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The Sun

• The sun is the biggest, brightest, and hottest
  object in the solar system.
• The sun is an ordinary star.
• The sun is made of about 70 hydrogen and 28
  helium.

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Mercury

• Mercury is solid, rocky, and is covered with
  craters.
• Mercury has almost no atmosphere.
• There are no moons on mercury
• Mercury is the smallest of our eight.

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Venus

• Venus is the sixth largest planet. Its slightly
  smaller than Earth.
• The surface is rocky and very hot. The atmosphere
  completely hides the surface and traps the heat.
• Venus has no moons.

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Earth

• Earth is the fifth largest planet and the third
  from the sun.
• It is a rocky planet covered mostly by water.
• The Earth has one moon.

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Moon
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Mars

• Mars is the fourth planet from the sun.
• Mars is rocky
• Mars has a thin atmosphere of mostly carbon
  dioxide.
• Mars has two small moons.

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Moons of Mars

• Phobos
• Deimos

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Jupiter

• The Great Red Spot, a huge storm of swirling gas
  that has lasted for hundreds of years.
• Jupiter does not have a solid surface. The planet
  is a ball of liquid surrounded by gas.
• Jupiter has over 65 moons!

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Io
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Europa
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Ganymede
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Callisto
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Saturn

• Saturn is the second largest planet and the sixth
  from the sun.
• Saturn is made of materials that are lighter than
  water. If you could fit Saturn in a lake, it
  would float!
• Saturn has 62 moons.

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Rings of Saturn

• Saturns rings are not solid they are composed
  of small particles of ice and rock.

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Uranus

• Uranus is the third largest planet and the
  seventh from the sun.
• Uranus is one of the giant gas planets.
• Uranus is blue-green because of the methane in
  its atmosphere.

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Neptune

• Neptune is the fourth largest planet and the
  eight from the sun.
• Like Uranus, the methane gas gives Neptune its
  color.
• Neptune has 13 known moons

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How Did We Learn All This?Now, lets look
at a few of historys greatest contributions to
space exploration and learn about the different
crafts used.
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Galileo Galilei
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Robert Goddard
Robert H. Goddard is know as the American father
of modern rocketry He built and tested the
world's first liquid-fuel rocket in 1926. Over
the course of his career, Goddard not only
developed the calculations for rocket flight and
also made advances in rocket design and
construction.
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What is a rocket?Rockets are space craft
with chemical propellants used to escape the
earths gravity.
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Sputnik 1The first manmade satellite to orbit
the earth Soviet Union.
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Explorer 1The first U.S. satellite to orbit the
Earth.
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What is a satellite?An object that orbits
another object. They can be natural , like a
moon orbiting a planet, or artificial, like
Explorer 1.
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Natural Satellites
These planets are all satellites of the sun
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
Pluto
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Artificial Satellites
Artificial satellites have been around for 50
years and have 3 main uses
1) Observation (e.g. Hubble Space Telescope)
these are in orbit high above the Earth and can
observe the universe without interference
2) Communications radio, phone, navigation
3) Monitoring weather and spying
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Voyager 1 and 2These were probes
discovered many things including the rings and
moons of the far away gas giant. It is the
farthest man mad object in space.
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What is a probe?A space probe is a robotic
spacecraft that leaves Earth orbit and explores
space.
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NASAStrands for National Aeronautics and Space
Administration. It is our governmental agency
devoted to exploring space.
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Apollo MissionsThese missions were to land a man
on the moon and return him safely.
"That's one small step for a man. One giant leap
for mankind."- Neil Armstrong
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The Space ShuttleThis program created the first
reusable space craft that could carry people and
cargo to and from space.