spacecraft

4. The largest known one of these is 600 miles wide!
9. Space is completely _____. Since it is a vacuum, sound waves will have no medium to travel to. That means, no one will hear you scream in space, even if you shout the loudest!
10. All of the planets in the solar system have been visited by these (without crews).
12. Jupiter is the _____ planet in our solar system.
13. One day on _____ is longer than one year. The orbit of this planet around the Sun is 225 Earth days, making a year on Earth 18 days less than a day there.

1. There is a _____ on Mars three times the size of Everest.
2. This famous comet only orbits past earth every 75-76 years.
3. The footprints on the Moon will be there for 100 _____ years.
5. In 1986, NASA found what they thought may be _____ of microscopic living things in a rock recovered from Mars.
6. The International Space Station is about as wide as one of these.
7. If two pieces of the same type of _____ touch in space they will permanently bond.
8. There are more stars in the universe than all the gains of _____ on Earth.
11. This planet orbits the Sun on its side - earning the nickname, "the sideways planet".