1.Which statement about asteroids is NOT true?
A.Some of them have their own names.
B.Some have their own little moons.
C.Some are bigger then Pluto.
D.They have an atmosphere.

2.While hiking,you found a piece of rock and discovered that it comes from Mars.What's the explanation behind this?
A.Mars and Earth crashed into each other a while ago,and Mars left some debris behind.
B.The rock broke off from Mars a while ago and came to Earth as a meteor.
C.A meteoroid came to Earth on a comet.
D.An alien came and left it on Earth.

3.If comet Halley appears every 75 years and it's last appearance was in 1986,when is it's next appearance?
A. 2021
B. 2041
C. 2061
D. 2081

4.Ana was 8 years old when she saw come Halley.At what age will she see comet Halley again?
A. 80
B. 81
C. 82
D. 83​