Inner Planets
These are the four inner planets in order.
What is Mercury, Venus, Earth, Mars?
These are the four outer planets in order.
What is Jupiter, Saturn, Uranus, Neptune?
These are the three classifications of galaxies scientists have.
What is spiral, elliptical, and irregular?
These are the two planets that have no moons.
What is Mercury and Venus?
These are the two planets that have rings of rock, ice, and dust around them.
What is Saturn and Uranus?
The sun is classified as this astronomical body. Despite how large it appears; it is only medium-sized.
What is a star?
These are the two inner planets that have thick atmospheres.
What are Venus and Earth?
These two planets are so cold, scientists suspect that the gases might have frozen into ice near the middle.
What are Uranus and Neptune?
This is the name of the spiral galaxy that we live in.
What is the Milky Way?
This is only other planet in the solar system that is likely to be inhabitable by humans.
What is Mars?
This special planet has four very large moons that Galileo discovered. It helped Galileo reason that planets were something different than stars.
What is Jupiter?
These are the three parts of a spiral galaxy that you often see in diagrams.
What is the bulge, disk, and arms?
What is Iron and/or nickel?
All outer planets contain this substance, which our sun also contains.
What is hydrogen?
This force changes in strength from planet to planet. It allows astronauts on the moon to jump much higher than they do on Earth.
What is gravity?