| A | B |
|---|
| matter | what all things are made of |
| unruly | hard to discipline and control |
| disruptive | causing trouble |
| hypothesis | guesses about how things work |
| speed of light | the speed at which light from the sun travels |
| equation | a mathematical statement that shows how two things are equal |
| idle | not busy |
| slaughter | the killing of a large number of people, usually in battle |
| trenches | long ditches used to protect soldiers |
| black holes | small areas in the universe with powerful amounts of gravity |
| total eclipse of the sun | the complete blocking of the sun by the moon |
| Nobel Prize | one of the six international prizes given every year for outstanding work |
| refugee | a person who runs away for protection, usually to another country |
| contemplate | to think about carefully |
