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Take up worksheets -other objects in solar system -solar system chart

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Take up worksheets-other objects in solar system-solar system chart Measuring distance from Space Why do we need special units for astronomy -we are dealing with a ... – PowerPoint PPT presentation

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Title: Take up worksheets -other objects in solar system -solar system chart


1
Take up worksheets-other objects in solar
system-solar system chart
2
(No Transcript)
3
  • Measuring distance from Space
  • Why do we need special units for astronomy
  • -we are dealing with a lot of space, large
    distances (hard to relate to)
  • Astronomical Units (AU) is a unit of measure
    created by astronomers for measuring distances in
    the solar system, it is equal to the ORBITAL
    distance between the EARTH and SUN, about 150
    million km
  • Orbital Radium The average distance between the
    STAR (SUN) and the object orbiting the SUN, it is
    expressed in AUs

4
  • Light-Year the distance that light travels in a
    year, about 9.5 x 1012 km
  • Trans-Neptunian Objects
  • Objects that circle the sun beyond the orbit of
    Neptune are called trans-Neptunian objects they
    are located in the KUIPER BELT, which is a
    disc-shaped group fo millions of small objects
    orbiting the Sun. Astronomers theorize that the
    Kuiper Belt is composed of leftovers from the
    formation of the Solar System, think of it as the
    dust around the edges of a patio after you sweep
    it.

5
  • Why is Pluto considered a transNeptnian object?
  • Sometimes its orbit crosses over Neptunes
    orbit. Pluto has 3 moons that orbit it however it
    is also smaller than the largest Kuiper Belt
    object which also has a moon orbiting it, so
    Pluto was demoted to Dwarf Planet
  • The Oort Cloud is a spherical cloud of small icy
    fragments of debris at the farthest reaches of
    the Suns gravitational pull. It is between 50000
    AU and 100 000 AU from the Sun and roughly 1/4 of
    the distance between the sun and Proxima
    Centauri, the nearest star.

6
  • Comets
  • Most comets originate in the Kuiper Belt and the
    Oort cloud at the farthest reaches of our solar
    system. Comets are composed of ICE, Frozen Gases
    and Dust particles. When a comet is pulled inward
    by the gravitational force of the SUN, it either
    collides with the planet or is pulled into the
    inner solar system and begins to orbit the Sun.
    AS the comet approaches the Sun it melts as the
    Suns radiation releases the gas and particles in
    the comet and the wind from the sun pushes the
    gas and particles away creating the tail. The
    comet has two tails and these two tails do not
    always point in the same direction because the
    dust tail is often slightly curved, it follows
    the orbit of the comet, while the gas or ion tail
    is more strongly affected by the solar winds and
    is pushed away from the sun.

7
  • Asteroids
  • Most asteroids originate in the asteroid belt,
    which is found between mars and Jupiter. They are
    small, non-spherical objects that are believed to
    be debris left over from the formation of the
    universe
  • They range in size from a tiny speck, like a
    grain of sand to about 500 km wide. Some
    asteroids are so large they have been promoted to
    a dwarf planet and some even have their own moon.

8
  • Meteoroids, Meteors, Meteorites
  • A meteoroids is a piece of rock moving through
    space, they are thought to be rocky chunks that
    have broken off asteroids and planets. When
    meteoroids collide with Earths atmosphere they
    burn up due to the atmospheric friction and form
    meteors. Many people mistake meteors for shooting
    stars and in certain times of the year Earth
    passes through an areas where there is a lot of
    excess material, such as debris left over from a
    comet and a meteor shower results.
  • Meteor showers often seem to come from certain
    constellations and are therefore named for those
    constellations, such as the Lenoid meteor shower,
    seen in November and the Perseid meteor shower
    seen in August (image is of the Perseids)
  • If a meteor survives impact on Earth and reaches
    the ground it becomes a meteorite, scientists
    estimate that about 100 000 tonnes of material
    from meteorites reach Earths surface annually.

9
  • Approximately 65 million years ago an asteroid
    the size of a mountain struck Earth the result
    was a catastrophic change to Earths atmosphere.
    Some scientists hypothesize that these changes
    are responsible for global mass extinctions of
    thousands of species, including the dinosaurs.
  • Approximately 39 million years ago, an object 2
    km in diameter hit Devon Island Nunavut. The
    crater left is known as Haughton Crater. A second
    impact occurred approximately 40 000 to 50 000
    years ago in Arizona.
  • Most recently still, on June 30, 1908 in
    Tunguska, Siberia an area the size of Kingston
    Ontario was destroyed when an object entered
    Earths atmosphere. The object flattened nearly
    100 million trees and killed tens of thousands of
    forest mammals, including several large herds of
    reindeer. Scientists believe that the object was
    about 50 km in diameter-no remnants of the object
    were found.

10
Questions
  • Meteor to Meteorite
  • Comet and Asteroid
  • Difference between an Asteroid and Meteoroid
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