Tag: Gravitational
Gravitational waves: a new technique to detect them with gamma rays
The first pulsar was discovered in 1967 when Jocelyn Bell detected a celestial pulse signal at a frequency 81.5 MHz radio at Mullard Radio Astronomy Observatory near Cambridge, UK. Quickly,…
Are fast radio bursts sources of gravitational waves?
We know that we entered the era of gravitational astronomy in 2015, almost 100 years after Albert Einstein’s complete shaping of his relativistic theory of gravitation, the famous theory of…
Gravitational waves: the Earth-Moon couple could serve as a giant detector
Each time a new spectral band has opened up in the domain of electromagnetic waves for’astrophysics, resulting in new discoveries. We can cite in this respect the beginnings of radio…
Gravitational waves: the origin of the enigmatic black holes of Ligo and Virgo becomes clearer
Many mergers detected by Ligo and Virgo involve black holes whose masses exceed those of stellar black holes betrayed by X-ray emissions. Scenarios have been proposed to account for the…
Gravitational assistance: what is it?
Gravitational assistance is a technique using the attraction of planets to give extra speed to an interplanetary probe. We also speak of the gravitational sling effect. This technique is now…
Gravitational waves would have made the Big Bang space-time turbulent
Space-time is not a material medium, yet its dynamics resemble that of fluids. Like them, it could have become turbulent, especially at the time of the Big Bang, when it…