0
$\begingroup$

This question already has an answer here:

I read that two huge black holes collided or merged and so it created gravitational waves billion years ago , So now we are able to detect it & detected it. So what is the speed of gravitational wave ? Is it faster than light ? and are there many more to be detected ?

$\endgroup$

marked as duplicate by Sir Cumference, Hohmannfan, Mike G, James K, zephyr Sep 14 '16 at 18:35

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ Have you tried Wikipedia? en.wikipedia.org/wiki/Gravitational_wave $\endgroup$ – Peter Erwin Sep 14 '16 at 9:09
  • $\begingroup$ There are probably many more to be detected; another merger was detected three months later (announced this past June). $\endgroup$ – Peter Erwin Sep 14 '16 at 9:11
4
$\begingroup$

Gravitational waves travel at the speed of light.

There are many possible sources of gravitational waves. The two confirmed detections so far (14 Sep 2016) are merging black hole binary systems, but sources of (detectable) gravitational waves may include merging neutron stars, short period binaries containing neutron stars or white dwarfs, gamma ray bursters or supernovae.

For a brief introduction see Gravitational Wave Sources at the ALIGO site.

$\endgroup$
  • $\begingroup$ But why? Space expands faster than the speed of light, why can't it ripple it faster too? And if a gravity wave is caused by massive materia interacting in a lumpy star going supernova, or in two massiv material neutron stars colliding, then the GW should move slower because massive materia cannot move that fast. That's my intuition anyway. $\endgroup$ – LocalFluff Sep 14 '16 at 15:24
  • 1
    $\begingroup$ @LocalFluff The detected waves were used to infer the initial and final masses of the merging BHs. As GR is fully compliant with causality, that tells you straight away that GWs do not travel faster than light. The speed of the wave and the speed of the object producing it are not directly linked (as indeed they are not in electromagnetism). $\endgroup$ – Rob Jeffries Sep 14 '16 at 15:51

Not the answer you're looking for? Browse other questions tagged or ask your own question.