The Solar System

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The Solar System
Astronomy
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Did you ever wonder?
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What is the solar system?
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What is the solar system?

• The solar system is the sun and the objects that
  are traveling around it.

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SUN

• Our sun is an average size star similar to many
  other stars in the night sky. It appears so large
  and bright to us because it is much closer to
  earth.

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What is the sun composed of?

• The sun is mostly composed of hydrogen and
  helium. The formation of helium from hydrogen is
  what generates light and heat from the sun.

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The Nine Planets

• Mercury
• Venus
• Earth
• Mars
• Jupiter

• Saturn
• Uranus
• Neptune
• Pluto

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The Nine Planets

• The path around the sun is called an orbit.
• One complete trip of an object around the sun
  takes one year.
• A year is different from planet to planet.

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What keeps the planets in orbit?
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What keeps the planets in orbit?

• He describes gravity as the property of all
  matter.
• Gravity is the force of attraction, or pull,
  between any object and any other objects around
  it.
• Gravity depends on two measurements, mass and
  distance.

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Inertia

• Inertia is the tendency of a moving object to
  keep moving in a straight line.

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Gravity Inertia

• Together gravity and inertia keep the planets in
  orbits.

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What makes a day?

• The sun provides light and warmth.
• All planets spin or rotate like huge spinning
  tops.

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Inner Planets

• Small
• Warm
• Rocky crusts
• Craters
• None have rings
• All have atmospheres
• Few if any moons

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Inner planets

• Mercury

• Venus

• Earth

• Mars

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Mercury

• Closest plant to the sun
• Orbits the sun in the shortest time
• Very hot on one side and very cold on the other
  side because it rotates very slowly.
• No moons

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Venus

• Hottest planet
• Very dense cloud coverage
• Lots of volcanoes
• Clouds hold in heat
• Temperatures reach 900 F
• Rotates backwards
• No moons

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Earth

• Water planet
• Our home
• Only planet with temperatures and resources for
  life as we know it
• One moon

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Mars

• Has the largest volcano in our solar system
  called Olympus Mons
• Strong winds
• Pink dust storms
• May have had water at one time
• Two moons that move in opposite directions.

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Outer Planets

• Jupiter, Saturn, Uranus, Neptune Gas giants
• Pluto Tiny and icy
• Dense and rocky cores
• Dense liquids surround the cores of each planet
• Each gas giant is surrounded by large envelopes
  of gasses
• The gas giants have rings
• All outer planets have moons

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Outer Planets

• Jupiter
• Saturn
• Uranus

• Neptune
• Pluto

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Jupiter

• Largest planet
• Fastest spinner
• A day is less then 10 hours long
• It has a giant red spot-a storm-that has lasted
  over 300 years
• Lightning bolts and auroras can be seen on
  Jupiters night side

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Saturn

• If you could find an ocean big enough, it would
  float!
• It is less dense then water
• It has the most visible and beautiful rings of
  all the planets
• It is almost twice as far from the Sun as
  Jupiter.

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Uranus

• It has been called the planet that was knocked
  on its side
• Because of its tilt, its poles take turns
  pointing towards the sun even so, it is hotter
  at its equator
• A day on Uranus is 17 ½ hours long
• It takes 84 Earth years to orbit the Sun

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Neptune

• 4.5 billion km from the sun
• A year is 165 Earth years long
• A day is 16 hours long
• Winds whip around Neptune at almost 1250 miles
  per hour

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Pluto

• Farthest planet form the sun
• Made up of frozen gases
• Only planet that has not yet been visited by
  spacecraft
• Little is known about Pluto and its moon, Charon
• There is a debate among astronomers over whether
  Pluto should be called a planet

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Constellations

• A star is a large hot ball of gas that is held
  together by gravity and gives off its own light.

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Constellations

• Stars arranged in groups that form patterns in
  the sky are called constellations.