April 25 in Physics History

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birthdays & deaths

Explore all birthdays & deaths of physicists occurred on this day with their short biography!

physics Events

Know all important discoveries made by physicists & events happened on this day with complete information!

April 25 in Physics History - Births – Physicists born on April 25

James Peebles (Born on 25 Apr 1935)

He is a Canadian-American astrophysicist, theoretical cosmologist, and astronomer who is widely regarded as one of the world’s leading theoretical cosmologists since 1970. Currently, he is a professor of science at Princeton University. He made major contributions in the field of dark matter, the cosmic microwave background, structure formation, and primordial nucleosynthesis. He also shared the Nobel Prize for Physics in 2019 for his discovery of an exoplanet orbiting the Sun-like star.

Wolfgang Pauli (25 Apr 1900 - 15 Dec 1958)

He was an Australian American physicist who discovered the Pauli exclusion principle in 1925. The Pauli exclusion principle states that in an atom two electrons can’t occupy the same Quantum state simultaneously. His discovery won him the Nobel Prize for Physics in 1945.

Gerard Henri de Vaucouleurs (25 Apr 1918 - 7 Oct 1995)

He was a French-born US astronomer, who produced three Reference Catalogues of bright galaxies. His theories helped understand the age of the large-scale structure of the universe. His Catalogues were not merely for finding lists or data collection lists but consisted of astrophysically useful databases. He believed in applying as many different and independent techniques as possible to check for scale and zero point errors.

Guglielmo Marconi (25 Apr 1874 - 20 Jul 1937)

He was an Italian electrical engineer and inventor who obtained the world’s first patent for a system of wireless telegraphy in 1897 and he also opened the world’s first radio factory at Chelmsford England. He invented the wireless telegraph known as the radio in 1935. When he lacked support from the Italian Ministry of Posts and telegraphs, he turned to the British post office. His famous patent No. 7777 was for “tuned or syntonic telegraphy.

April 25 in Physics History - Deaths – Physicists died on April 25

Anders Celsius (27 Nov 1701 - 25 Apr 1744)

He was a Swedish astronomer who built Sweden’s first observatory in 1741. He succeeded his father as a professor of astronomy in 1730. He is famous for the temperature scale that he developed which is widely used to date. With his assistant Olof Hiortner, he developed that aurora Borealis influence compass needles.

William McCrea (13 Dec 1904 - 25 Apr 1999)

He was an Irish theoretical astrophysicist who ranged from considering the stellar atmospheres of planet formation and the formation of stars and the universe. Before he turned to apply theoretical physics in astronomy, he worked in the field of quantum physics. He studied gas dynamics and later developed the theory of the transition from increasing density to conditions sufficient for gravitational collapse and possible star formation.

Siméon-Denis Poisson (21 Jun 1781 - 25 Apr 1840)

He was a French mathematician who is known for the Poisson’s integral, Poisson’s brackets in differential calculus, Poisson’s constant in elasticity, and Poisson’s equation in potential theory. He also worked on advancement in Fourier series, definite integrals, electromagnetic theory, and probability.

April 25 in Physics History - Events – Physics Events of April 25

Hubble Space Telescope Deployed In Space

The Hubble scope telescope was deployed in space on 25 April 1990, from the space shuttle Discovery (It was launched on 24 April 1990). It was into an orbit 381 miles above Earth. Its primary mirror was found to be flawed and it produced blurred images. But, on 25 Dec 1993, it was replaced. Since then, it provides images with clarity.

Pioneer 10 Crossed Pluto

On this day, Pioneer 10 crossed the orbit of the outermost planet, Pluto in 1983. Pioneer’s last, very weak signal was received on 23 January 2003.

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