Multiple choice

What year were black holes thought to be discovered?

  1. 1912

  2. 1916

  3. 1934

  4. 1893

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

In 1916, Karl Schwarzschild found the first exact solution to Einstein's field equations, describing what we now call a black hole. This mathematical solution came soon after Einstein published general relativity in 1915. However, actual observational evidence didn't come until decades later with Cygnus X-1 in the 1960s-70s.