January 9 in Physics History

Physics history will help you to develop a better understanding of the physics world!

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!

January 9 in Physics History - Births – Physicists born on January 9

No Physicist Born on This Day

January 9 in Physics History - Deaths – Physicists died on January 9

Caroline Lucretia Herschel (16 Mar 1750 - 9 Jan 1848)

She was a German-born British astronomer who assisted his brother, Sir William Herschel in his astronomical researches making calculations associated with studies. In her telescope observations, she found three nebulae and eight comets. She also published the index to Flamsteed’s observations of the fixed Stars and a list of his mistakes in 1797.

Rupert Wildt (25 Jun 1905 - 9 Jan 1976)​

He was a German American astronomer who identified certain absorption bands in the spectra of Jupiter and the outer planets. This led him to the study of the atmosphere of planets and it was discovered that the outer planets contain ammonia and methane as minor components. He also discovered that droplets of formaldehyde formed the clouds of Venus because the water was not detected. He proposed the greenhouse theory that explained that atmospheric gas is produced at unexpectedly high temperatures in Venus.

Heber Curtis (27 Jun 1872 - 9 Jan 1942)​

He was an American astronomer who is famed for debating Harlow Shapley on 26 Apr 1920 before the National academy of Sciences. He spoke for “island universes”—whereby spiral nebulae were composed of stars, and represented galaxies far outside the Milky Way. Shapley disagreed, believing that our galaxy was 300,000 light-years in diameter and included the spiral nebulae. By the end of 1924, Curtis was shown to be correct, when a paper from Edwin Hubble was read to the American Astronomical Society on 1 Jan 1925. After his early work measuring radial velocities of the brighter stars, but in 1910 he became active in nebular photography, trying to find evidence of their nature as isolated independent star systems.

January 9 in Physics History - Events – Physics Events of January 9

The Successful Landing of Surveyor 7

On this day, the Surveyor 7 space probe made a soft landing on the moon in 1968. It was the last of the five American series of unmanned explorations of the lunar surface. It was the only Surveyor craft of the series to land in a lunar highland region. It was sent to take pictures after landing, to determine relative chemical element abundance, and to manipulate the lunar material.

The Discovery of Accelerating Galaxies

On this day, 2 teams of international scientists collaborated and announced the discovery that the galaxies are actually accelerating and not simply moving away. In 1998, they discovered that the galaxies are flying apart at ever faster speeds. This observation also hinted towards the existence of a mysterious, self-repelling property of space. It was first proposed by Sir Albert Einstein.

The Ashen Light of Venus

Giovanni Ruccioli first reported this phenomenon in which a faint luminance is observed in the night side of Venus. It was reported in 1643, on this day. It occurs mostly when Venus is in the evening sky. It is similar to “earthshine” on the moon. But it is not that bright. The cause of this ashen light of Venus is still unknown.

The Stellar Parallax

Stellar Parallax was first recognized by the Scottish Astronomer Royal, Thomas Henderson, in 1839. He observed Alpha Centauri from the Cape of Good Hope. He made his measurements between 1831 and 1833. Though, Friedrich Vessel and Friedrich Strive became the first to make measurements of stellar parallax.

Don’t Miss Our Newsletter!