Gravitational radiation has been found
A) indirectly, by measuring changes in the orbits of neutron stars.
B) directly, by using lasers to measure tiny changes in distances on Earth.
C) In both A and B.
D) by neither A nor B; gravitational radiation is only a theoretical idea.

Question

Quizplus · Accepted Answer

Gravitational radiation, or gravitational waves, have been detected both indirectly and directly. Indirect evidence came from observations of the orbital decay of binary neutron stars, most famously the Hulse-Taylor binary, which matched predictions from general relativity. Direct detection was achieved by LIGO (Laser Interferometer Gravitational-Wave Observatory) and other facilities, which use lasers to measure minuscule changes in distances between mirrors, caused by passing gravitational waves.

Gravitational Radiation Has Been Found