Black Holes Explained: teacher key

Black Holes, grade 5 edition, written for 5th grade. A black hole is a place in space where gravity is so strong that even light cannot get out. See how stars make them, how big they get and how scientists caught ripples from two of them.

Read the book. Print this page for the key.

Questions and answers

1. Where did detectors catch ripples from two black holes crashing together?
   • Texas and Maine
   • Ohio and Utah
   • Louisiana and Washington (answer)
2. What is the glowing disk of gas around a black hole called?
   • The singularity
   • The accretion disk (answer)
   • The event horizon
3. Black hole X has no gas near it. Black hole Y has a bright glowing disk of gas around it. Which one is easier to see?
   • X
   • Both the same
   • Y (answer)
4. 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?
   • 13 years
   • 30 years
   • 3 years (answer)
5. What does orbit mean?
   • Travel around (answer)
   • Burn up
   • Fall asleep

Words

• accretion: glowing gas disk
• singularity: center point
• orbit: travel around