💫Nuevo!! Nuevos enlaces a los Buscadores más utilizados, en un desplegable de la barra lateral. Accede directamente a Google, Wikipedia, etc.

💫Ahora ya puedes recibir las entradas en tu Email, suscríbete en la barra lateral.

💫Si eres Autor prueba la opción Nueva Entrada. Utiliza Chrome para ver el blog completo.

💫Los aficionados ya pueden escribir sobre astronomía. Date de alta como Autor en Universo Mágico Público.

💫Comunidades de Astronomía en Google Plus: Universo Mágico - Astronomy Lab - Space Roads - Space World - Astronomy Station

💫Grupos de Astronomía en Facebook: Astronomy & Space Exploration - Universo Mágico - Big Bang - Galicia Astronómica

💫Young and Old Stars Found in Andromeda's Halo

Communities & Groups:     (New)  Space World Google+        Big Bang Facebook



The deepest visible-light image ever taken of the sky resolves approximately 300, 000 stars in the halo of the nearest neighboring spiral galaxy, Andromeda (M31). The photo was taken with the Advanced Camera for Surveys aboard the NASA/ESA Hubble Space Telescope. Because the image captures both faint dwarf stars and bright giant stars, astronomers can estimate the age of the halo population by analyzing its distribution of colour and brightness. The halo is a spherical cloud of stars around Andromeda, located 2.5 million light-years from Earth.



Relying on the deepest visible-light images ever taken in space, astronomers using NASA's Hubble Space Telescope (HST) have reliably measured the age of the spherical halo of stars surrounding the neighboring Andromeda galaxy (M31). To their surprise, they have discovered that approximately one-third of the stars in Andromeda's halo formed only 6 to 8 billion years ago. That's a far cry from the 11-to-13 billion-year age of the stars in the Milky Way's halo.

Credit: NASA, ESA and T.M. Brown (STScI)


Communities & Groups:     (New)  Space World Google+        Big Bang Facebook

Publicar un comentario