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Unit 2: Astronomy
Lesson 2: Objects in the Universe
Stars
Massive, hot balls of super heated gas called plasma.
Planets
Orbits the sun Round Dominates its orbit
Dwarf Planets
Orbits the sun Round Has not cleared it’s orbit
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
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.
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.
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.
Today’s Activity
Solar System Sort