|The Big Bang occurred about ____ billion years ago.
|The nearest star to the Sun is about ____ light-years away.
|Neptune is about ____ astronomical units away from the Sun.
|Light from the Sun reaches the Earth in about ____ minutes.
|Earth rotates about ____ times per orbit around the Sun.
|Both Jupiter and Saturn have about ____ moons.
|The Moon is about ____ miles from the Earth.
|Humans first walked on the Moon in July ____.