astrophysics

The first Observation of Gravitational Waves

The first Observation of Gravitational Waves

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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Jerry R. Ehman, the Wow! Signal and the Search for Extraterrestrial Intelligence

Jerry R. Ehman, the Wow! Signal and the Search for Extraterrestrial Intelligence

On August 15, 1977, a strong narrowband radio signal was received by the Big Ear radio telescope of the Ohio State University, United States, then assigned to a SETI project. Astronomer Jerry R. Ehman discovered the signal a few days later, while reviewing the recorded data and was so impressed that he circled the reading on the computer printout and wrote the comment Wow! on its side. Jerry R. Ehman received a…
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Cecilia Payne-Gaposchkin and the Composition of Stars

Cecilia Payne-Gaposchkin and the Composition of Stars

On May 10, 1900, British–American astronomer and astrophysicist Cecilia Helena Payne-Gaposchkin was born. She was the first to apply laws of atomic physics to the study of the temperature and density of stellar bodies, and the first to conclude that hydrogen and helium are the two most common elements in the universe. It was another 20 years before Payne’s original claim was confirmed, by Fred Hoyle. Cecilia Payne-Gaposchkin – Early Years Cecilia…
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Subrahmanyan Chandrasekhar and the Evolution of Stars

Subrahmanyan Chandrasekhar and the Evolution of Stars

Subrahmanyan Chandrasekhar (1910-1995) On October 19, 1910, Indian-American astrophysicist and Nobel Laureate Subrahmanyan Chandrasekhar was born. He won the 1983 Nobel Prize for Physics together with William Alfred Fowler for key discoveries that led to the currently accepted theory on the later evolutionary stages of massive stars. If you are a frequent reader of this blog, you might have encountered articles about scientists, artists, or explorers you might have never heard of.…
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