A __________________ is any unidentified flying object. Some people think they are alien spaceships.
UFO
A __________________ is a kind of alien life that lives on Mars.
Martian
The _________________ is very big. It means all the space, stars and planets that exist.
The Universe
I saw a __________________ in the sky last night! It was large and round. I’m sure it was an alien spaceship!
flying saucer
Do you think we should try to __________________ aliens? Should we try to communicate with them?
contact
Earth is a __________________. Mars is, too.
planet
Some people are afraid that aliens might not be friendly. They might want to __________________ us
attack
Does an alien look like a __________________? Does it have two eyes, two arms, and stand on two legs?
human
A) What kind of movies do you like to watch? B) I love _________________ movies about aliens.
science fiction
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune are planets in our __________________.
Solar system
Do you think scientists will ever ________________ life on other planets? What kind of life will they find?
discover
Are aliens smart? Are they ________________?
intelligent
You can see things far away with a _________________.
telescope