Multiple choice

Which of the following is NOT true about black holes?

  1. They are formed when a supermassive star collapses

  2. They are found at the center of active galaxies

  3. Scientists can observe them indirectly

  4. They are predicted to occur, but none have been observed

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Black holes have been observed indirectly through their gravitational effects on nearby stars and gas, and the first direct image of a black hole's shadow was captured in 2019.