Multiple choice Which of the following is NOT true about black holes? They are formed when a supermassive star collapses They are found at the center of active galaxies Scientists can observe them indirectly 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.