12 March
2004: On 12 March 2004, the Sun ejected a spectacular 'eruptive prominence' into the heliosphere. SOHO, the ESA/NASA solar watchdog observatory, faithfully recorded the event.
31 DÉC. 2003
Date de publication
1391
Vues
2003: On 13 March 2003, a mainly European team led by Alfred Vidal-Madjar (Institut d’Astrophysique de Paris, CNRS, France) reported in Nature the observation of the atmosphere of an extrasolar planet evaporating into space.
Using the NASA/ESA Hubble Space Telescope, astronomers observed phenomenon for the first time. The scorched planet called HD 209458b orbits ‘only’ 7 million kilometres from its yellow Sun-like star. By comparison, Jupiter, the closest gas giant in our Solar System, orbits 780 million kilometres from our Sun.
Hubble observations revealed a hot and puffed-up evaporating hydrogen atmosphere surrounding the planet. Much of this planet may eventually disappear, leaving only a dense core. It is a type of extrasolar planet known as a 'hot Jupiter'. These giant gaseous planets orbit their stars very closely, drawn to them like moths to a flame.
Modal média
11 March
2004: On 11 March 2004, the Rosetta Science Working Team made the final selection of the asteroids that ESA's Rosetta will observe at close quarters during its journey to Comet 67P/Churyumov-Gerasimenko.
10 March
1977: On 10 March 1977, the rings of Uranus were discovered from Earth.
9 March
2004: On 9 March 2004, astronomers working with the NASA/ESA Hubble Space Telescope unveiled the deepest portrait of the visible Universe ever achieved.
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