Black Holes: teacher key

Black Holes, grade 2 edition, written for 2nd grade. A black hole is a place in space where gravity is so strong that even light cannot get out. Learn what black holes are, how they grow and how we saw one.

Read the book. Print this page for the key.

Questions and answers

1. What is the edge of a black hole called?
   • The Milky Way
   • A ring
   • The event horizon (answer)
2. In what year did scientists show the first picture of a black hole?
   • 1915
   • 2019 (answer)
   • 1990
3. Black hole A has a lot of stuff around it. Black hole B has almost none. Which one can grow bigger?
   • B
   • Both the same
   • A (answer)
4. A space rock has light shining out of it. Could it be a black hole?
   • Yes
   • No (answer)
   • Only at night
5. What does event horizon mean?
   • A kind of star
   • The edge of a black hole (answer)
   • A telescope

Words

• horizon: its edge
• supermassive: biggest black holes
• invisible: not seen