lesson 2: objects in the universe. massive, hot balls of super heated gas called plasma
TRANSCRIPT
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Unit 2: Astronomy
Lesson 2: Objects in the Universe
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Stars
Massive, hot balls of super heated gas called plasma.
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Planets
Orbits the sun Round Dominates its orbit
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Dwarf Planets
Orbits the sun Round Has not cleared it’s orbit
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Moons (satellites)
Natural or artificial objects that revolve around larger objects like planets.
All planets except for Mercury and Venus have moons.
Mars’ moon, Phobos
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Comets
A small object made of rock and ice that orbit the sun.
When a comet passes close enough to the sun, the solar radiation heats up the ice causing it to melt and form a gas in the form of a tail.
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Asteroids
Small, rocky object that orbits the sun.
Have irregular shapes (not round). Most asteroids orbit the sun in the
wide region between Mars and Jupiter – this is called the Asteroid Belt.
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Meteoroid
Small, rocky object that orbits the sun Smaller than an asteroid
Meteorite – when the meteoroid
enters the Earth’s atmosphere and strikes the ground.
Meteor – the bright streak formed when a meteoroid or a comet burns up in the atmosphere.
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Today’s Activity
Solar System Sort