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Our Milky Way Galaxy

junio 15, 2016

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Imagenes de Paisajes Naturales Imagenes Del Universo Profundo

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The Red Spider Nebula is home to one of the hottest stars ever known. Credit ESA & Garrelt Mellema (Leiden University, the Netherlands)

The Red Spider Nebula is home to one of the hottest stars ever known. Credit: ESA & Garrelt Mellema (Leiden University, the Netherlands)

A never-before-seen view of the turbulent heart of our Milky Way galaxy

A never-before-seen view of the turbulent heart of our Milky Way galaxy provided by the NASA/ESA Hubble Space Telescope and its companion Great Observatories (the Spitzer Space Telescope and the Chandra X-ray Observatory) is being unveiled on 10 Nov 2009. This event will commemorate the 400 years since Galileo first turned his telescope to the heavens in 1609. Although best known for its visible-light images, Hubble also observes over a limited range of infrared light and this sweeping panorama is the sharpest infrared picture ever made of the galactic centre region. The composite image – made up of an image from each telescope – features the spectacle of stellar evolution: from vibrant regions of star birth, to young hot stars, to old cool stars, to seething remnants of stellar death called black holes. This activity occurs against a fiery backdrop in the crowded, hostile environment of the galaxy's core, the centre of which is dominated by a supermassive black hole nearl...

Finding the ashes of the first stars [artist's impression]

Artist's impression of a quasar located in a primeval galaxy (or protogalaxy) a few hundred million years after the Big Bang. Astronomers used the NASA/ESA Hubble Space Telescope to discover substantial amount of iron in three such quasars. This is the first time that anyone has found elements believed to have been created exclusively by the first generation of stars. Information about the very first generation of stars has been one of the Universe's best-kept secrets. When the first stars ended their lives as supernovae, the explosions expelled gas into space. These 'ashes' contained heavier elements such as oxygen, carbon, silicon, and iron created in the nuclear furnaces within the centres of stars. This new discovery allows astronomers to construct a revised timescale for the history of the Universe. About 13.7 thousand million years ago, the Universe is created in the Big Bang. In this cataclysmic hot explosion, hydrogen and helium are almost the only subst...

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