4 ms·

there are a total of 4 now, I believe.

• lisper 6y ago
  Where did you hear that? Wikipedia only knows of two. https://en.wikipedia.org/wiki/LIGO https://en.wikipedia.org/wiki/LIGO It would be really weird to build more than two because they are incredibly expensive and the incremental value of the third and fourth ones wouldn't be very high.
  • roywiggins 6y ago
    With several, wouldn't you be able to localize the waves to particular areas of the sky better? That would probably be useful. Expensive, but useful.
    • magicalhippo 6y ago
      Indeed. See the light green (just LIGO) vs dark green (LIGO + Virgo) areas in this[1] picture. [1]: https://www.ligo.org/images/GW170817_images/GW170817-frontpg.png https://www.ligo.org/images/GW170817_images/GW170817-frontpg...
  • formerly_proven 6y ago
    There are more graviational wave detectors than just LIGO (2). There's at least GEO600, KAGRA and Virgo.