1. We've learned light travels 186,000 miles a second. The distance light travels in 365 days is known as a light _____ ?

second
minute
day
year

2. The four inner planets are rocky, small and relatively close together. Which description best describes the next four outer planets which are far from the sun?

They are also rocky, small, and close together
They are large, made of ice, and close together
They are small, made of ice, and relatively far apart
They are very large, made of gases, and relatively far apart

3. Our nearest star neighbor in space, Alpha Centauri, is 4 light years from the Earth. Why would it be difficult to visit?

It is very bright and hot.
We are not exactly sure where it is.
There may be no planets near it.
It would take too many years to reach it.

4. Which of the following correctly ranks the objects by size, smallest to the BIGGEST?

Earth, sun, solar system, galaxy, universe
Sun, solar system, Earth, universe, galaxy
Universe, galaxy, solar sysytem, Earth, sun
Solar system, Earth, sun, universe, galaxy