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Vocabulary
Planets
Earth
The Sun
Vocabulary Part 2
100
A large, round, object that revolves around a star and has cleared the region around it's orbit.
Planet
100
The only planet known to support life.
Earth
100
The difference between Earth's rotation around the Sun and it's revolution around the Sun. 
Rotation = 24 hours; Revolution = 365 days
100
A burning ball of gas at the center of our solar system
The Sun
100
A group of stars that form a pattern
Constellation
200
A natural object that revolves around a planet.
Moon
200
Known as the Red Planet.
Mars
200
This keeps Earth in it's orbit around the sun.
Gravity
200
Which planet is closest to the sun?
Mercury
200
A spacecraft that gathers data without a human crew
A space probe
300
An imaginary line around which a planet spins.
Axis
300
The planet closest to the Sun.
Mercury
300
Explain how Earth has seasons.
The tilt on Earth's axis causes the northern or southern hemisphere of the planet to be closer or further away from the Sun. 
300
Which planet is furthest away from the Sun?
Neptune
300
A rocky mass several hundred kilometers wide that revolves around the Sun
An asteroid 
400
One full orbit around another object.
Revoloution
400
The Gas Giants
The outer planets: Jupiter, Saturn, Uranus, and Neptune
400
How longs does it take for Earth to rotate around the Sun?
24 hours
400
What are solar flares?
Eruptions of radiation and heat from the sun's surface.
400
A frozen mass of different types of ice and dust orbiting the Sun
A comet
500
One whole spin of an object around its axis.
Rotation
500
There are known as the terrestrial planets (rocky)
The inner planets: Mercury, Venus, Earth, and Mars.
500
How long does it take for Earth to revolve around the Sun?
365 days
500
The layers of the Sun

The Photosphere, the Chromosphere, and the Corona

500
A small piece of rock that has entered Earth's atmosphere and is burning up. 
A meteor, aka a shooting star.