1. An unmanned research spacecraft sent beyond Earth’s orbit is called a ______.
A. shuttle
B. meteor
C. satellite
D. probe
2. Any object that orbits another object in space is called a _____________.
A. satellite
B. probe
C. comet
D. meteor
4. A ________ occurs when the moon passes between the earth and the sun.
A. lunar eclipse
B. solar eclipse
C. star eclipse
D. planetary eclipse
3. Each orbit that a planet makes around the sun is called a(n) _____________ .
A. eclipse
B. revolution
C. rotation
D. axis
