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The first Observation of Gravitational Waves

The first Observation of Gravitational Waves

Tabea Tietz
On September 14, 2015, the LIGO Scientific Collaboration observed gravitational waves from a 410 megaparsec (1.3 billion light years) distant merger of two black holes. Previously, gravitational waves had only been inferred only indirectly, via their effect on the timing of pulsars in binary star systems. It was also the first observation of a binary black hole merger, demonstrating both the existence of binary stellar-mass black hole systens, and the fact that…
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physics
Sir Roger Penrose and the Singularity

Sir Roger Penrose and the Singularity

Harald Sack
On August 8, 1931, English mathematical physicist, mathematician and philosopher of science. Sir Roger Penrose was born. Penrose is known for his work in mathematical physics, in particular for his contributions to general relativity and cosmology. In 1969, with Stephen Hawking, Penrose proved that all matter within a black hole collapses to a singularity, a geometric point in space where mass is compressed to infinite density and zero volume. Youth and Education…
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physics
John Michell and the Effect of Gravity on Light

John Michell and the Effect of Gravity on Light

Tabea Tietz
Probably on December 25, 1724, English natural philosopher and geologist John Michell was born. He is best known as both a theorist and an experimenter, who was the first to propose the effects of gravity on light, later resulting in the physics of general relativity and black holes. John Michell – Background John Michell was born in Eakring, Nottinghamshire, UK, the son of Gilbert Michell, a priest, and Obedience Gerrard. However, his exact…
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physics
Stephen Hawking and the Hairy Black Holes

Stephen Hawking and the Hairy Black Holes

Harald Sack
When I read the news that Stephen Hawking passed away, I was rather sad. I grew up with a fascination for astronomy and cosmology. Trying to understand the fabrics and working of the universe, I devoured his popular books and articles and I am rather thankful. Amongst others it was foremost this unique physicist, who planted the seed for my decision to become a scientist myself. However, I abandoned physics after high…
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physics
Roy Kerr and Mysterious Rotating Black Holes

Roy Kerr and Mysterious Rotating Black Holes

Tabea Tietz
On May 16, 1934, New Zealand mathematician Roy Kerr was born. Kerr is best known for discovering the Kerr geometry, an exact solution to the Einstein field equation of general relativity. His solution models the gravitational field outside an uncharged rotating massive object, including a rotating black hole. Roy Kerr – Early Years Roy Kerr was educated at the private school St Andrew’s College. His talent for mathematics was first recognized during…
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