The sun and all its planets and objects make up this.
What is the Solar System?
100
These 2 planets have different rotational directions from the others.
What are Venus and Uranus?
200
Another name for the inner planets.
What are the terrestrial planets?
200
The largest of the inner planets.
What is Earth?
200
This planet’s rings were the first to be seen by humans.
What is Saturn?
200
This was named after the god of the underworld.
What is Pluto?
200
The lightest planet.
What is Saturn? It could float in a bath tub if it could fit in one!
300
Another name for the outer planets.
What are the gas giants or Jovian planets?
300
The hottest planet. Why?
What is Venus? Its cloud-covered atmosphere traps the sun's heat.
300
This planet has a giant, red storm.
What is Jupiter?
300
This planet was named after the Roman god of the sea.
What is Neptune?
300
The number of planets with rings.
What is 4?
400
The number of planets whose days are shorter than the Earth's day (rotation speed).
What is 4?
400
Its day is longer than its year.
What is Venus?
400
1,000 Earths could fit inside this planet.
What is Jupiter?
400
The word planet comes from the Latin word "planetae," which means this.
What is "wanderer"?
400
The number of moons Mars has.
What is 2?
500
It needs to be in orbit around the Sun
It needs to have enough gravity to pull itself into a spherical shape
It needs to have “cleared the neighborhood” of its orbit
What is the definition of a planet? This is why Pluto is no longer a planet.
500
The smallest planet (its year is only 88 days long!).
What is Mercury?
500
The windiest planet.
What is Neptune?
500
This planet was named for the Roman messenger of the gods.
What is Mercury?
500
The brightest object in the night sky, not including the Earth's moon.