Inside the Black Hole Story: teacher key

Black Holes, grade 4 edition, written for 4th grade. A black hole is a place in space where gravity is so strong that even light cannot get out. See how black holes form, why we can still find them, and what they look like.

Read the book. Print this page for the key.

Questions and answers

1. How much mass does Sagittarius A* have?
   • About 4 Suns
   • About 4 Moons
   • About 4 million Suns (answer)
2. What happens when something crosses the event horizon?
   • It lands on a hard surface
   • Nothing can come back out (answer)
   • It turns into a star
3. Scientists showed the first picture of a black hole in 2019 and the picture of our galaxy's black hole in 2022. How many years apart were they?
   • 30 years
   • 13 years
   • 3 years (answer)
4. Some black holes have as much mass as millions of Suns. Sagittarius A* has about 4 million Suns of mass. Could it be one of those black holes?
   • No
   • Not sure
   • Yes (answer)
5. What does orbit mean?
   • Burn up
   • Travel around (answer)
   • Fall asleep

Words

• orbit: travel around
• supermassive: biggest black holes
• evaporate: shrink away