24 July
1853: On 24 July 1853, Henri-Alexandre Deslandres was born.Deslandres was a French astrophysicist who invented a spectroheliograph to photograph the Sun in monochromatic light and made extensive studies of the ...
27 HELMI. 2004
Julkaisupäivä
1340
Katselukerrat
2003: On 25 July 2003, astronomers using ESA’s X-ray observatory, XMM-Newton, announced that they had discovered a pair of X-ray tails, stretching 3 million million kilometres across the sky. They emanate from the mysterious neutron star known as Geminga. The discovery gave astronomers new insight into the extraordinary conditions around the neutron star.
A neutron star measures only 20-30 kilometres across and is the dense remnant of an exploded star. Geminga is one of the closest to Earth, at a distance of about 500 light-years. Most neutron stars emit radio emissions, appearing to pulsate like a lighthouse, but Geminga is 'radio-quiet'. It does, however, emit huge quantities of pulsating gamma rays making it one of the brightest gamma-ray sources in the sky. Geminga is the only example of a successfully identified gamma-ray source from which astronomers have gained significant knowledge.
Mediamodaali
23 July
On 23 July every year, the Perseid meteor shower begins.The shower begins when Earth enters the edge of a cloud of debris from Comet Swift-Tuttle. Dust-sized particles hit the atmosphere ...
22 July
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 ...
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 ...
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