|
Mercury and Venus have no moons. Mars has ____ moons.
|
2
|
|
The Big Bang occurred a little less than ____ billion years ago.
|
6
|
|
Earth rotates about ____ times per orbit around the Sun.
|
7
|
|
An asteroid smashed into Earth about____ million years ago.
|
8
|
|
There are ____ main stars in the Big Dipper asterism.
|
14
|
|
Your weight (not mass) would be ____ times less on the Moon.
|
24
|
|
It takes about ____ hours for Earth to complete one rotation.
|
66
|
|
There are ____ planets in the Solar System.
|
365
|
