Hubble UV deep field: New image shows galaxies galore. One of the biggest leaps in astronomy made by the Hubble Space Telescope was something dreamed up long after it launched: Taking extremely long exposure images of a part of the sky unobscured by foreground junk (like stars, gas, and dust in our own galaxy) to see what could be seen. These images were called the Hubble Deep Fields, because they could see extraordinarily faint galaxies deep in the Universe. Phil Plait writes Slate’s Bad Astronomy blog and is an astronomer, public speaker, science evangelizer, and author of Death from the Skies! Follow him on Twitter. Since the first one was taken in 1995, there have been many others.
Some looked at different areas of the sky, some combined the data from other telescopes, and some looked in different wavelengths of light. That last part is important: When massive stars are born, they emit ultraviolet light, but due to the expansion of the Universe, that gets shifted to the red by the time the light gets here. And now we’ve got one! Hubble’s new UV eyes see the deep universe in ‘living color’ Astronomers using the Hubble Space Telescope have captured the most comprehensive picture ever assembled of the evolving universe and one of the most colorful. The study is called the Ultraviolet Coverage of the Hubble Ultra Deep Field (UVUDF) project. Credit: NASA/ESA/ H.
Teplitz and M. Rafelski, A. Koekemoer, R. Windhorst and Z. Levay Back in the 1960s when color TV programming was cutting edge, NBC-TV’s “Living Color” Peacock logo and announcement made sure we knew it. Time to bring back that peacock. Here’s the original Ultra Deep Field showing nearly 10,000 galaxies. Called the Ultraviolet Coverage of the Hubble Ultra Deep Field (UVUDF) project, astronomers used the Hubble’s Widefield Camera 3 to rephotograph the original field, a tiny patch of sky in the constellation Fornax as wide as what you’d see staring through an 8-foot-long soda straw. An edge-on spiral galaxy collides with a small, young blue galaxy in this detail from the original Hubble UDF.
Dans la Lune, l'Astronomie en Alsace. Le matériel astronomique a la réputation d'être extrêmement coûteux. C'est effectivement le cas pour certains instruments, mais il en existe bien d'autres très abordables. Dans le commerce on trouve des instruments produits dans des pays à bas coût de main d’œuvre qui ne sont pas sans défauts mais qui présentent un bon rapport qualité/prix. Sur le marché de l'occasion on peut trouver une multitude de vieux instruments de haute qualité à des prix dérisoires. Contrairement aux idées véhiculées par certains amateurs élitistes qui ont dû fumer de la poussière de comète, une lunette de 80 mm ou un télescope de 114 mm offrent d'énormes possibilités d'observation. Faire de l'Astronomie n'est pas un luxe.
Il est facile de calculer que ce loisir peut coûter bien moins cher que celui de fumer! La lunette Meade 90/1000 Côté catalogue, ce modèle succéda au début d’années 2000 au fameux modèle 395 qui était une excellente affaire à l’époque : 3000 francs, sur monture équatoriale. Pandora's Cluster: Hubble image reveals thousands of galaxies. Photo by NASA,ESA, and J. Lotz, M. Mountain, A. Koekemoer, and the HFF Team (STScI) As I was putting together my Best Astronomy Pictures of 2013 page, I was thinking that it had been a while since I had posted a jaw-dropping Hubble shot of galaxies. And then Hubble delivered. That stunning image shows Abell 2744, a huge cluster of galaxies located a mind-numbing 4 billion light years away.
I suggest you grab a higher-resolution version of the image (there's even a monster 3900 x 4360 pixel version). Get this: Those are actually entire galaxies, located far, far behind the cluster. Another fun benefit from gravitational lenses is that they boost the light from more distant galaxies. In the final image, more than 3,000 such distant galaxies can be spotted, some of which have a mass only 1/1,000th of our own Milky Way. This image is stunning. I’d stop dead in my work, gaping, the hair on the back of my neck rising as those thoughts seeped into my brain.
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