Apr. 25, 2013 — A strange
stellar pair nearly 7,000 light-years from Earth has provided physicists
with a unique cosmic laboratory for studying the nature of gravity. The
extremely strong gravity of a massive neutron star in orbit with a
companion white dwarf star puts competing theories of gravity to a test
more stringent than any available before.
Superdense
neutron star, emitting beams of radio waves as a pulsar, center, is
closely paired with a compact white-dwarf star. Together, the two
provide physicists with an unprecedented natural, cosmic "laboratory"
for studying the nature of gravity. The grid background illustrates the
distortions of spacetime caused by the gravitational effect of the two
objects. (Credit: Antoniadis, et al.)
At some point, however, scientists expect Einstein's model to be invalid under extreme conditions. General Relativity, for example, is incompatible with quantum theory. Physicists hope to find an alternate description of gravity that would eliminate that incompatibility.
A newly-discovered pulsar -- a spinning neutron star with twice the mass of the Sun -- and its white-dwarf companion, orbiting each other once every two and a half hours, has put gravitational theories to the most extreme test yet. Observations of the system, dubbed PSR J0348+0432, produced results consistent with the predictions of General Relativity.
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Sources: National Radio Astronomy Observatory, ScienceDaily.com .
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