Science
cartoon based on Gravitational constant is universal constant.
Four
fundamental forces are electromagnetic, strong nuclear, weak nuclear
and gravitational. There was a century old question in cosmology: Is
the force of gravity the same everywhere and at all times? According
to Scott Ransom, an astronomer with the National Radio Astronomy
Observatory in Charlottesville, Va. "Though it appears on Earth
to be constant and universal, there are some theories in cosmology
that suggest gravity may change over time or may be different in
different corners of the Universe.".
Till
now, astronomer were conforming the gravitational constant within our
solar system. Astronomers used the National Science Foundation's
(NSF) Green Bank Telescope (GBT) in West Virginia and its Arecibo
Observatory in Puerto Rico and studied the pulsar PSR J1713+0747 for
21-years and measured various parameters very precisely. Study of the
said pulsar and associated white dwarf star revealed that the
gravitational constant is not changing. This is the first time that
the conformity test of gravitational constant is tested out of our
solar system. Thus it can be said Gravitational constant is universal
constant.
Reference:
http://www.sciencedaily.com/releases/2015/08/150806144557.htm
