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1. Some __________ planes can fly more than 483 kilometers per hour (300 miles per hour).
propeller (revolving shaft)
2. To escape Earth's _________ and travel into space, a rocket ship must go faster than any jet.
gravity (The force that attracts a body towards the center of the earth)
3. Sometimes speeds are hard to _______.
measure (ascertain the size, amount, or degree of something)
4. A cheetah can't run as fast as a peregrine falcon can _______.
swoop (fly downward)
5. A real light beam, however, becomes bright and ______ only when it hits such things as dust or water particles.
visible (able to be seen)
6. Some meteoroids ______ through space at 241,402 kilometers per hour (150,000 miles per hour).
streak (Move very fast in a specified direction)
7. A peregrine falcon is three times as fast as a car zooming along a _______.
highway (a main road)
8. Speeding through space at 40,234 kilometers per hour is ______ fast.
mighty (very)
9. Light beams flashing through space are usually shown as bright ______.
rays (light)
10. You can turn off your rockets and ______ after you're in space.
coast (Keep moving without using additional power)
11. A peregrine falcon is _______. It can dive faster than any creature can run.
magnificent (impressively beautiful)
12. A light ______ will flash out at the amazing speed of 299,338 kilometers per second.
beam (A light sturdy of squared timber or metal)
13. At high _______, where jets fly, sound waves travel about 1,062 Kilometers per hour.
altitudes (The height of an object from sea or ground level)
14. Light is the fastest travelling thing in the whole _______.
universe (all existing matter and space)
15. A runner can reach a _______ of 24 kilometers per hour.
speed (The rate at which someone or something moves)
16. The speed of sound is not _______.
constant (can change)
