Animals or plants that might live on other planets are called __________________.
alien life
astronauts
astronomers
Some people believe that there might be alien life on __________________.
gravity
Mars
Earth
Last year, I got a __________________ as a birthday present. Now I look at the stars every night.
rocket
planet
telescope
Our __________________ has eight planets.
rocket
solar system
spaceship
I don’t live on the moon. I live on ________________.
Mars
Venus
Earth
__________________ makes things fall down.
gravity
alien life
world
When I was a kid, I wanted to be an __________________ and travel in space.
rocket
spaceship
astronaut
The __________________ from the Earth to the sun is about 150 kilometers
distance
world
alien life
Galileo Galilei was a famous _________________ who used a telescope to study the night sky 400 years ago.
world
astronomer
solar system
Astronomers have discovered hundreds of other _________________ that orbit (travel around) other suns.
stars
rockets
planets
The planet Neptune was _______________ in 1846. People didn’t know it existed before that time.
discovered
invented
explored
Why do people want to __________________ space? Why do they want to find out what is out there?
dance
explore
create
__________________, like the one in the picture, carry astronauts into space.
rockets
telescopes
aliens
Another word for our planet is “__________________”.
house
place
world
Perhaps, humans will travel in __________________ to other solar systems and planets in the future.
spacecars
spaceships
spaceplanes
