Gravitational waves open a new 'window' on the universe because:

  1. they reveal events that emit little or no light, like black hole mergers
  2. they replace telescopes entirely
  3. they are slower than light
  4. they are visible to the eye
Answer

A) they reveal events that emit little or no light, like black hole mergers

Gravitational-wave astronomy. SLO P-11-D-18 · Understanding

Physics MCQ · More Gravitational Waves MCQs · Practise