Scientists find proof of gravitational waves
Q. What are gravitational waves?- Published on 12 Feb 16a. Faint ripples in space time
b. Fourth dimension which is hard to fathom
c. Collision which sends ripples across the universe
d. Both a and b
ANSWER: Both a and b
Sound waves may exist but hearing the experience has proved to be unforgettable for physicists worldwide. Gravitational waves were first theorised by Albert Einstein in 1916 as part of the theory of general relativity. These are faint ripples in space time which are a forth dimension. What happens is that when massive yet compact objects such as black holes or neutrons combine through collision, gravity sends ripples across the universe. While the indirect proof of the existence of gravitational waves in 1970s led to the awarding of the 1993 Nobel Prize in physics, this announcement is considered a direct detection of the gravitational wave. Gravitational waves are the soundtrack of the universe and Einstein theorised that scientists would ever be able to hear them. Sensitivity is vital for the LIGO instrument detecting the waves as LIGO detects waves that stretch and squeeze the entire Milky Way galaxy by as little as the width of the thumb.Each LIGO has two giant arms more than 2 miles long which are perpendicular. A laser beam is split and travels both ways bouncing off mirrors to return to the arms' intersection. Gravitational waves stretch the arms to create an incredibly tiny mismatch infinitely smaller than a subatomic particle which is detected by LIGO.
