Gravity

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In this PodcAstroholic we answer the question, if gravity tends to form spheres why are some galaxies shaped like discs?

Today, in my day job I wrote about the momentous discovery of gravitational waves by LIGO. There are four major discoveries associated with the detection: First of all, today it was announced that on 14th September 2015 gravitational waves were observed by both LIGO detectors. This is the first time an experiment has been able […]

For all intents and purposes gravity travels at the speed of light but it is very hard to measure, and so far we have no direct model-independent measurement of the speed of gravity. Physics has to main gravitational models: Newtonian dynamics and General Relativity The Newtonian gravitational model assumes that the gravitational interaction is instantaneous, and […]