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Solar System
The Sun and all the objects that orbit around it.
Terrestrial Planets
The four inner planets made of solid rock and metal.
Gas Giants
The four outer planets made mostly of gas and ice.
Mercury
The smallest planet and closest to the Sun.
Venus
The hottest planet with a thick, toxic atmosphere.
Mars
The Red Planet with iron-rich soil and thin air.
Jupiter
The largest planet in our solar system, famous for its Great Red Spot storm.
Saturn
A gas giant famous for its large, bright rings.
Uranus
An ice giant planet that spins sideways on its axis.
Neptune
The farthest major planet from the Sun, famous for fast winds and deep blue color.
Nebular Theory
The idea that our solar system formed from a spinning cloud of gas and dust.
Orbit
The curved path an object takes as it travels around another object in space.
Gravity
The pulling force that keeps planets in orbit around the Sun.
Ellipse
An oval-shaped path that planets follow around the Sun.
Astronomical Unit (AU)
A unit of distance equal to the distance from Earth to the Sun.