  With the detection of Gravitational waves just about an year ago Einstein`s
general theory of relativity- a space-time theory of gravity, got established
on a firmer footing than any other theory in physics. Gravitational waves are
just propagating disturbances in the gravitational field of extremely strong
sources caused by some catastrophic event associated with cosmic bodies, like
binary black hole coalescence, or neutron star mergers. As these events happen
very far away in cosmos, and the signal strength would be extremely weak, it
requires extraordinary detection and analysis technology to observe an event on
earth. Luckily the joint collaboration LIGO-VIRGO, have so far detected two
events in September and December of 2015 during their analysis of observations
made with the laser interferometers over the last few observing sessions. The
talk will give a brief theoretical sketch of the analysis required for
describing the waves resulting from mass motion in the realm of general
relativity, and point out, the serious and sincere efforts of the past fifty
years that went into the final success. An attempt will be made to point out
the enormous scope that is available for the new generation of students and
researchers in pursuing the topic as a new window for possibly viewing the
Universe with the implications for the studies of Dark matter, Dark energy and
Cosmology as a whole.
