The Solar System
This is a vast cloud of gas and dust in space where stars and planets form.
A Nebula
The largest planet in the solar system.
Jupiter
A huge collection of stars held together by gravity.
Galaxy
The average distance between Earth and the Sun.
Astronomical Unit
The spinning motion of an object on its axis.
Rotation
The most widely accepted theory explaining how the solar system formed.
Nebular Theory
These four planets have rocky surfaces.
Terrestrial Planets
The name of our galaxy.
The Milky Way
How long sunlight takes to reach Earth.
8 Minutes
The motion of one object orbiting another.
Revolution
This force caused gas and dust to collapse toward the center of the nebula
Gravity
Saturn’s largest moon, which is bigger than Mercury.
Titan
This type of galaxy has a bulging center and spiral arms.
Spiral Galaxy
The formula used to calculate sunlight travel time.
AU x 8 mins
The distance light travels in one year.
Light Year
The early stage of the Sun before nuclear fusion fully stabilized.
Proto-Sun
These planets are called ice giants. (2)
Uranus & Neptune
The process that fuels stars by releasing energy.
Nuclear Fusion
Which travels faster: light or sound?
Light
A massive explosion caused by a dying star.
Supernova
The region of the solar system where temperatures allow liquid water to exist.
Goldilocks Zone
The four largest moons of Jupiter discovered by Galileo.
Io, Europa, Ganymede, and Callisto?
Light from objects moving away from Earth shifts toward this color.
Red Shift
If Mars is 1.52 AU from the Sun, how long will it take the Sun's rays to reach Mars?
~12 minutes
The apparent movement of objects caused by changing position.
Parallax