On Mon, 1 Feb 2016 12:08:59 -0800 (PST), Quadibloc
wrote:

The claim that there is such a thing as a "gravitational wave" can be tested by
observation.

Thus, for example, the fact that the period of pulsars changes slowly means
that two orbiting masses, since as they occupy different areas in space, they
pull in different directions, are actually sending out energy in the form of
gravitational waves - and thus losing energy.

While that is very strong evidence for gravitational radiation, it is,
of course, only evidence. Most physicists believe that we are only a
year or two away from more direct observations of gravitational waves
by LIGO type instruments. That too, will be evidence, not proof,
meaning those who choose to deny reality will continue to deny (proof,
of course, being an impossible standard).