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Celestial Object
Any object that exists in space. i.e. moon, planets, stars.
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Astronomer
A scientist who studies astronomy.
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Constellation
A group of stars that form a distinctive pattern in the sky
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Light-year
the distance that light travels in one year. 9.5 X 10*12 km
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Absolute Magnitude
The magnitude of a star that we observe if the star were 32.6 light years from Earth
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Apparent Magnitude
The brightness of a star as seen on Earth
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Asterism
A smaller group of stars that form a pattern within constellations or multiple constellations.
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Pointer Stars
- They are the two stars in the big dipper when followed lead to Polaris or the North Star

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Phases of the Moon
- The monthly progressions in the moons appearance that results in different portions of the moon sunlit side being visible from Earth

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Lunar Eclipse
When the full moon passes into Earth's shadow.
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Planets (include inner planets & outer planets)
- an object that orbits one or more stars and is not a star itself. is spherical and doesn't share an orbit with another object.
- The inner planets include Mercury, Venus, Earth, Mars.
- Then an asteroid belt separates them.
- Jupiter, Saturn, Uranus, and Neptune are the outer planets.
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Astronomical unit
The average distance between Earth and the Sun about 150 x 10*6. Also know as AU.
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Orbital Radius
The average distance between the sun and the object that is orbiting it.
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Geocentric model
Model of the solar system stating that the Earth is the center of all planetary motion. With the planets and sun moving in perfect circles.
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Heliocentric Model
Model of the solar system that in which the Sun is the center and all the planets revolve around it.
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Comet
An object that is made up rocky material,ice, and gas. It comes from Kuiper Belt and Oort Cloud.
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Asteroid
It is an object in space and ranges in a speck of sand to 500 km. They usually come from the asteroid belt between Mars and Jupiter.
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Meteoroid
a piece of rock moving through space
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Meteor
A meteoroid that hits the earth's atmosphere and burns up.
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Meteorite
Is a meteor that is large enough to pass through the earth's atmosphere and reach the ground with being totally burned up
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