Sur fond de galaxies lointaines, la majestueuse spirale poussiéreux, NGC 3370, à tisser dans l'avant-plan dans cette image du télescope spatial Hubble de la NASA. De récentes observations prises avec la caméra avancée pour les enquêtes montrent la structure des bras spiraux tachetées de zones chaudes de nouveau la formation des étoiles. Mais cette galaxie est plus qu'un joli visage. Près de 10 ans plus tôt en 3370, NGC la constellation du Lion, l'hôte d'une explosion d'une étoile lumineuse. En novembre 1994, la lumière d'une supernova à proximité de NGC 3370 a atteint la Terre. Cette explosion stellaire a écarté l'ensemble de l'brièvement des dizaines de milliards d'autres étoiles dans ses galax

• Contributeur: American Photo Archive / Alamy Banque D'Images
• ID de l’image: 2AD8549
• Taille du fichier: 76,9 MB (2,5 MB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 6031 x 4456 px | 51,1 x 37,7 cm | 20,1 x 14,9 inches | 300dpi

Informations supplémentaires

Cette image peut avoir des imperfections car il s’agit d’une image historique ou de reportage.

Amid a backdrop of far-off galaxies, the majestic dusty spiral, NGC 3370, looms in the foreground in this NASA Hubble Space Telescope image. Recent observations taken with the Advanced Camera for Surveys show intricate spiral arm structure spotted with hot areas of new star formation. But this galaxy is more than just a pretty face. Nearly 10 years earlier NGC 3370, in the constellation Leo, hosted a bright exploding star. In November 1994, the light of a supernova in nearby NGC 3370 reached Earth. This stellar outburst briefly outshone all of the tens of billions of other stars in its galaxy. Although supernovae are common, with one exploding every few seconds somewhere in the universe, this one was special. Designated SN 1994ae, this supernova was one of the nearest and best observed supernovae since the advent of modern, digital detectors. It resides 98 million light-years (30 megaparsecs) from Earth. The supernova was also a member of a special subclass of supernovae, the type Ia, the best tool astronomers have to chart the growth rate of the expanding universe. Recently, astronomers have compared nearby type Ia supernovae to more distant ones, determining that the universe is now accelerating in its expansion and is filled with mysterious "dark energy." Such measurements are akin to measuring the size of your room by stepping it off with your feet. However, a careful measurement of the length of your foot (to convert your measurements into inches or centimeters) is still needed to know the true size of your room. Similarly, astronomers must calibrate the true brightness of type Ia supernovae to measure the true size and expansion rate of the universe.

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