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💫Apollo 17 landing region

This image showcases Hubble Space Telescope's first high-resolution ultraviolet and visible imaging of the Apollo 17 landing region within the Taurus-Littrow valley of the Moon. Humans last walked and drove on the lunar surface in this region (marked "+" in the image) in December 1972. The image was taken Aug. 16, 2005 by Hubble's Advanced Camera for Surveys. North is at the top of the image. The image was processed by the Hubble Space Telescope Lunar Exploration team at NASA's Goddard Space Flight Center, Northwestern University, and the Space Telescope Science Institute.

NASA, ESA, and J. Garvin (NASA/GSFC)

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💫M83 detail

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Nicknamed the Southern Pinwheel, M83 is undergoing more rapid star formation than our own Milky Way galaxy, especially in its nucleus. The sharp "eye" of the Wide Field Camera 3 (WFC3) has captured hundreds of young star clusters, ancient swarms of globular star clusters, and hundreds of thousands of individual stars, mostly blue supergiants and red supergiants.

The image at right, taken in August 2009, is Hubble's close-up view of the myriad stars near the galaxy's core, the bright whitish region at far right. An image of the entire galaxy, taken by the European Southern Observatory's Wide Field Imager on the ESO/MPG 2.2-meter telescope at La Silla, Chile, is shown at left. The white box outlines Hubble's view.

Credit: NASA, ESA and Z. Levay (STScI) / R. O'Connell (University of Virginia), the WFC3 Science Oversight Committee, and ESO

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💫Galaxy cluster RCS2 032727-132623

Thanks to the presence of a natural "zoom lens" in space, NASA's Hubble Space Telescope got a uniquely close-up look at the brightest "magnified" galaxy yet discovered. This observation provides a unique opportunity to study the physical properties of a galaxy vigorously forming stars when the universe was only one-third its present age. A so-called gravitational lens is produced when space is warped by a massive foreground object, whether it is the Sun, a black hole, or an entire cluster of galaxies. The light from more-distant background objects is distorted, brightened, and magnified as it passes through this gravitationally disturbed region. A team of astronomers led by Jane Rigby of NASA's Goddard Space Flight Center in Greenbelt, Md., aimed Hubble at one of the most striking examples of gravitational lensing, a nearly 90-degree arc of light in the galaxy cluster RCS2 032727-132623. Hubble's view of the distant background galaxy is significantly more detailed than could ever be achieved without the help of the gravitational lens. The results have been accepted for publication in The Astrophysical Journal, in a paper led by Keren Sharon of the Kavli Institute for Cosmological Physics at the University of Chicago.

Professor Michael Gladders and graduate student Eva Wuyts of the University of Chicago were also key team members. The presence of the lens helps show how galaxies evolved from 10 billion years ago to today. While nearby galaxies are fully mature and are at the tail end of their star-formation histories, distant galaxies tell us about the universe's formative years. The light from those early events is just now arriving at Earth. Very distant galaxies are not only faint but also appear small on the sky. Astronomers would like to see how star formation progressed deep within these galaxies. Such details would be beyond the reach of Hubble's vision were it not for the magnification made possible by gravity in the intervening lens region. In 2006 a team of astronomers using the Very Large Telescope in Chile measured the arc's distance and calculated that the galaxy appears more than three times brighter than previously discovered lensed galaxies.

In 2011 astronomers used Hubble to image and analyze the lensed galaxy with the observatory's Wide Field Camera 3. The distorted image of the galaxy is repeated several times in the foreground lensing cluster, as is typical of gravitational lenses. The challenge for astronomers was to reconstruct what the galaxy really looked like, were it not distorted by the cluster's funhouse-mirror effect. Hubble's sharp vision allowed astronomers to remove the distortions and reconstruct the galaxy image as it would normally look. The reconstruction revealed regions of star formation glowing like bright Christmas tree bulbs. These are much brighter than any star-formation region in our Milky Way galaxy. Through spectroscopy, the spreading out of light into its constituent colors, the team plans to analyze these star-forming regions from the inside out to better understand why they are forming so many stars.

NASA, ESA, J. Rigby (NASA Goddard Space Flight Center), K. Sharon (Kavli Institute for Cosmological Physics, University of Chicago), M. Gladders and E. Wuyts (University of Chicago), and the Hubble Heritage Team (STScI/AURA)

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💫El estudio de galaxias distantes ayuda a comprender cómo se forman las estrellas

El estudio de galaxias distantes desafía la comprensión de cómo se forman las estrellas

19 de enero de 2018 por Marie Martig, The Conversation

💫NGC 922

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Episode 60 of the Hubblecast explores NGC 922, a galaxy that has been hit square-on by another.

Ripples of star-formation are still propagating out across thousands of light-years of space over 300 million years after the collision, making it a prime example of what astronomers call a collisional ring galaxy.

Credit: NASA & ESA

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💫Las muchas caras de Abell 1758

Norte, este, sur, oeste: Las muchas caras de Abell 1758

Fecha: 18 de enero de 2018

Fuente: ESA / Hubble Information Center

Parecido a un enjambre de luciérnagas parpadeantes, este hermoso cúmulo de galaxias brilla intensamente en el oscuro cosmos, acompañado por la miríada de brillantes luces de estrellas en primer plano y galaxias espirales en espiral. A1758N es un subgrupo de Abell 1758, un cúmulo masivo que contiene cientos de galaxias. Aunque puede parecer sereno en esta imagen del Telescopio Espacial Hubble de la NASA / ESA, el subgrupo en realidad comprende dos estructuras aún más pequeñas actualmente en el proceso turbulento de fusión.