21 July
1620: On 21 July 1620, Jean Picard was born.Picard is regarded as the founder of modern astronomy in France. He introduced new methods, improved the old instruments and added new ...
27 FÉVR. 2004
Date de publication
2317
Vues
1994: On 22 July 1994, the last of the large fragments of Comet P/Shoemaker-Levy (fragment W) hit Jupiter.
Starting on 16 July 1994, Comet P/Shoemaker-Levy's impact with Jupiter was the first collision of two Solar System bodies ever to be observed. Comet Shoemaker-Levy consisted of 20 discernable fragments with diameters estimated at up to 2 kilometres, which impacted the planet at 60 kilometres per second.
The impacts resulted in plumes many thousands of kilometres high, hot 'bubbles' of gas in the atmosphere and large dark 'scars' on the atmosphere. Dust continued to impact Jupiter for weeks afterwards.
1826: On 22 July 1826, Giuseppe Piazzi died.
Piazzi was an Italian astronomer who first discovered an asteroid - Ceres.
He also established an observatory at Palermo and mapped the positions of 7646 stars.
Piazzi discovered Ceres in 1801, but was able to make only three observations. Gauss had recently developed mathematical techniques that allowed the orbit to be calculated.
The thousandth asteroid discovered was named Piazzia in his honour.
Modal média
20 July
1969: On 20 July 1969, US astronaut Neil A. Armstrong became the first human to set foot on the Moon.As Commander of the Apollo 11 mission, he stepped from the ...
19 July
1846: On 19 July 1846, Edward Pickering was born.Pickering was an American physicist and astronomer. He directed the Harvard College Observatory for forty-two years. He and his staff made visual ...
18 July
1997: On 18 July 1997, Gene Shoemaker died.Shoemaker was an American planetary geologist. Shoemaker initiated and promoted the geology studies of American astronauts that made them able scientific observers and ...
Partager cette page
rester informé
Abonnez-vous à notre newsletter pour recevoir les dernières actualités, les mises à jour des missions et des informations exclusives directement dans votre boîte de réception. Soyez parmi les premiers informés de nos prochains projets et avancées.