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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
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(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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