|What qualifications have you got? http://www.rudeboytrain.com/index.php/ganeshpharmatechcom-0c32.pdf lotuspharmacy.ca What astronomers are doing is examining 20 pulsars to detect any alterations in the arrival times of the pulses that they emit. Pulsars act like precise clocks, in that in general, their pulses can be measured with extreme precision. However, if gravitational waves roll through the area of space-time which a pulsar is located in, then the arrival time of it’s pulses on Earth is altered. Any alteration detected by astronomers indicates that something, such as gravitational waves, are responsible.