It's the planet closest to the sun, and is believed to be the remaining core of a once-larger planet.
What is Mercury?
100
This dog sent up by Russia was considered the first animal in space.
Who was Laika?
100
These objects flying through space are composed mostly of ice and space dust, and the melting ice creates a long tail behind it.
What are comets?
100
The largest planet in our solar system, this gaseous giant is so large that over 1,300 earths could fit inside of it.
What is Jupiter?
100
The rings around the planet Saturn are not made from sunlight or gas but orbiting chunks of this material.
What is rock? (space rock, asteroids, meteors)
200
Our sister planet, this neighbor named for the Greek goddess of love is boiling hot and full of noxious (poisonous) gas.
What is Venus?
200
She was the first American woman in space and almost decided to be a pro tennis player instead of an astronaut.
Who is Sally Ride?
200
The best example of a meteor strike in the United States is the Barringer Crater, a massive hole in the ground that is 3,900 feet across and located in this southwestern state.
What is Arizona?
200
The planets orbit the sun not in a perfect circular path, but in this type of shape that is like an oval.
What is an ellipse or elliptical?
200
There is much less of this force on the moon than Earth.
What is gravity?
300
Another neighboring planet, this planet has air, volcanoes and is known as the "red planet" because of its color.
What is Mars?
300
This Russian jet pilot made history in 1961 when he became the first human to travel into space and to orbit the earth.
Who is Yuri Gargarin?
300
This meteorite flew into earth's atmosphere at 41,000 miles per hour above Russia in 2013, and its explosion caused these type of waves to shatter windows and crumble buildings.
What are shock (waves)?
300
It orbits our earth and is only 250,000 miles away, or three days by spaceship.
What is the moon?
300
It takes this long for the earth to orbit around the sun?
What is one year? (365 days, 364.4 days, 12 months)
400
The rings around this planet are formed from orbiting space rocks.
What is Saturn?
400
This American astronaut was the first human to walk on the surface of the moon and make "one small step for man, one giant leap for mankind".
Who is Neil Armstrong?
400
True or false? Millions of meteors occur everyday on the Earth, but most are too small and become dust upon entry to our atmosphere.
What is true?
400
The sun consists mostly of this gas that is also an ingredient of water.
What is hydrogen?
400
A large meteorite entered the earth's atmosphere at 41,000 miles per hour in 2013 causing a sonic boom that injured 1,500 people in this country.
What is Russia?
500
One of the planets made up mostly of gas, this large planet was named after the Greek god of the sea because of its blue color.
What is Neptune?
500
This Russian hero became the first woman to journey into space in 1962, twenty years before America did.
Who is Valentina Tereshkova?
500
The name given to the area in our solar system between the orbits of Mars and Jupiter that contains millions of asteroids.
What is the asteroid belt?
500
Our solar system is located in this galaxy.
What is the Milky Way?
500
It's the force that keeps the planets orbiting the sun and is believed to be the reason the planets were formed from space rock into their sphere shape.