16. What is a comet?
a) A celestial body that orbits a star and is made of rock and metal
b) A celestial body that orbits a star and is made of gas and dust
c) A celestial body that orbits a black hole
d) A celestial body that orbits a pulsar
17. What is a meteor?
a) A planet that has collided with another planet
b) A star that has exploded
c) A celestial body that burns up as it enters the Earth’s atmosphere
d) A galaxy that is on a collision course with another galaxy
18. What is an asteroid?
a) A celestial body that orbits a star and is made of gas and dust
b) A celestial body that orbits a black hole
c) A celestial body that orbits a star and is made of rock and metal
d) A celestial body that orbits a pulsar
19. What is the name of the mission that landed the first rover on Mars?
a) Voyager
b) Phoenix
c) Curiosity
d) Spirit
20. What is the name of the mission that landed the first rover on the far side of the moon?
a) Chang’e-3
b) Luna 9
c) Surveyor 1
d) Apollo 11
