Saturday, 30 August 2014



Select the correct term to complete the sentences.

speed of light
reference frame
black hole
general relativity
big bang
special relativity
time dilation

1. Every particle of matter has a(n) ____ twin.
2. ____ is equal to 3 × 108 meters per second.
3. ____ is a theory that describes what happens to matter, energy, time,
and space at speeds close to the speed of light.
4. An effect known as ____ causes time to move more slowly for an
object in motion than for one at rest.
5. According to ____ the force we call gravity is an effect created by the
curvature of space and time.
6. The perspective of an observer from which the position and motion of
a system can be described is called a(n) ____.
7. A(n) ____ is an object with such a strong gravity that its escape
velocity equals the speed of light.
8. According to the ____, the universe was once smaller than an atom
and began to expand after a huge explosion.