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Sun and Stars

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MARINER 4 and two Viking flights sent back close-up photographs of Mars. ... Saturn's rings are made of dust and ice. Jupiter is colorful, but scientists feel ... – PowerPoint PPT presentation

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Title: Sun and Stars


1
Solar System
  • Sun and Stars
  • Planets
  • Comets
  • Asteroids

2
Sun Our Nearest Star
  • The Sun is our nearest star.
  • A star is a ball of hot gases that pours out huge
    amounts of heat, light, and other energy.
  • The Sun can hold a million Earths.
  • If you could fly to the Sun, it would take 17
    years.
  • All life on Earth depends on the Sun.

3
Mercury Suns Nearest Planet
  • Mercury is the first planet from the Sun.
  • Mercury is a swift little planet.
  • Mercury is dry and hot.
  • Its closeness to the Sun makes it difficult to
    study.

4
Venus Hottest Planet
  • The second planet from the Sun is Venus.
  • Venus is hidden beneath deep, yellow sulfuric
    acid clouds.
  • Venuss air is mostly carbon dioxide (the air we
    breathe out).
  • The thick air around Venus acts as a blanket and
    traps the heat.
  • One of the largest craters in the Solar System is
    on Venus.

5
Earth Watery Planet
  • Earth is the only planet we know where life
    exists.
  • Atmosphere around Earth is made of oxygen,
    nitrogen, carbon dioxide, and other gases.
  • Earth revolves (circles) around the Sun once
    every 365 days (year).
  • It also rotates (spins) on its axis once every 24
    hours (day).

6
Moon Our Rocky Neighbor
  • Earth has one natural satellite, the Moon.
  • The moon is an airless little world.
  • It orbits (goes around) our planet once every
    month.
  • The moon was bombarded by asteroids and so has a
    heavily-cratered surface.
  • The first person to land on the Moon was Neil
    Armstrong.

7
Mars Red Planet
  • MARINER 4 and two Viking flights sent back
    close-up photographs of Mars.
  • Mars is a little more than half Earths size.
  • It takes Mars 2 years to orbit the Sun.
  • Mars soil has a lot of iron oxide (rust) that
    gives it a red color.
  • Mars has 2 moons.

8
Jupiter King of the Planets
  • Jupiter is the largest planet.
  • It is the first of the 4 giant, gas outer
    planets.
  • It has a well-known mark called the GREAT RED
    SPOT, which is 2 times the size of the U.S. It
    is an area of stormy winds.
  • Jupiter has no surface. Spaceships cannot land
    on it.
  • Jupiter has more than 17 moons (Ganymede is the
    largest moon in the Solar System.)

9
Saturn Planet with Ears
  • Saturn was first seen by an Italian astronomer
    named Galileo.
  • He said the planet had ears.
  • Saturns rings are made of dust and ice.
  • Jupiter is colorful, but scientists feel that
    Saturn is the most beautiful.
  • Saturn has more moons than any other planet.

10
Uranus Tipped-Over Planet
  • In 1781 an astronomer saw a small spot that was
    gliding backward across the sky. He knew that
    stars do not move that way. He knew it must be a
    planet Uranus.
  • Like Jupiter and Saturn it is made of gas. It
    also has faint rings.
  • It is tipped over on its side so that one pole
    faces the Sun giving it a day that lasts 42 Earth
    years.
  • Uranus also has several moons.

11
Neptune Last Giant
  • Neptune wasnt discovered until 1846.
  • It was named for the Roman god of water.
  • Even though it is the color of water, it is not
    made of water but of deadly gases like those
    found on Uranus.
  • The Hubble telescope will help us study the
    far-out planets.

12
Pluto Last Planet?
  • It is the smallest and last known planet.
  • Some astronomers think that it may not be a
    planet.
  • Sometimes Plutos orbit crosses Neptunes orbit.
    Then Neptune is the last planet.
  • Pluto has one moon.

13
Asteroids
14
Comets
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