The Inner Circle
This is the planet that is closest to the sun.
Mercury
This massive planet is so big that over 1,300 Earths could fit inside of it.
Jupiter
This belt of rocky debris sits in the "gap" between Mars and Jupiter.
Asteroid Belt
It takes Earth exactly this long to complete one full rotation on its axis.
24 hours
This is the name of our home galaxy.
Milky Way
Often called "Earth’s Twin" because of its size, this planet has a runaway greenhouse effect that could melt lead.
Venus
Though all four outer planets have them, this planet's rings are the most spectacular and visible from Earth.
Saturn
These "dirty snowballs" develop a glowing tail that always points away from the Sun.
Comets
It takes Earth 365.25 days to complete one of these around the Sun.
Revolution
This is the only planet in our solar system that is less dense than water (it would float in a bathtub!).
Saturn
This planet is home to Olympus Mons, the largest volcano in the entire solar system.
Mars
This planet is a "lazy" giant because it rotates on its side, likely due to a massive collision long ago.
Uranus
In 2006, this icy world was demoted from "Planet" to "Dwarf Planet.
Pluto
This invisible force is why the Moon stays "stuck" to Earth instead of floating away.
Gravity
This is the name of the star that provides energy for all life on Earth.
Sun
Unlike the gas giants, the inner planets are mostly made of these two materials.
Rock and Metal
This deep blue planet has the strongest winds in the solar system, reaching over 1,200 mph.
Neptune
When a meteoroid survives its trip through the atmosphere and actually hits the ground, it's called this.
Meteorite
Because the Earth revolves around the sun, we experience these throughout the year.
Seasons
This gas makes up about 78% of Earth’s atmosphere, even though we usually only talk about oxygen.
Nitrogen
This is the only inner planet that has more than one moon.
Mars
A massive, centuries-old, anticyclonic storm located in the southern hemisphere of Jupiter
Great Red Spot
This is the name of the donut-shaped region of icy objects beyond Neptune’s orbit.
Kuiper Belt
Most planets orbit in this shape, which is like a slightly flattened circle. What am I?
Ellipse
This is the term for a moon, or even a man-made machine, that circles a larger planet.
Satellite