Core of Galaxy NGC 4621
The core of ellipitical galaxy NGC 4621 is bright; it does not show 'light deficit.' Credit: NASA/AURA/STScI
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AstronomicalAstronomical
Light Deficit in Elliptical Galaxy Cores
Two giant elliptical galaxies, NGC 4621 and NGC 4472, look similar from a distance, as seen on the right in images from the Sloan Digital Sky Survey. But zooming into these galaxies' cores with Hubble Space Telescope reveals their differences (left, black and white images). NGC 4621 shows a bright core, while NGC 4472 is much dimmer. The core of this galaxy is populated with fewer stars. Many stars have been slung out of the core when the galaxy collided and merged with another.
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AstronomicalMoon, Venus, and Jupiter over UT Tower
The Moon, Venus, and Jupiter blaze over the Tower of The University of Texas at Austin campus on December 1, 2008. This photo was taken from a 16th floor window of Robert Lee Moore Hall, which houses the administrative offices of McDonald Observatory and the Department of Astronomy. Credit: Joel Barna
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AstronomicalFirst Pulsating Carbon White Dwarf
McDonald Observatory astronomers Michael Montgomery, Kurtis Williams, and Steven DeGennaro discovered that the star SDSS J142625.71+575218.3 is the first pulsating carbon white dwarf. Credit: Sloan Digital Sky Survey (SDSS) Collaboration (http://sdss.org)
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AstronomicalPulsations of a Carbon White Dwarf
This 'light curve' shows the changes in light output over time, or 'pulsations,' of the first-discovered pulsating carbon white dwarf, as measured by the Argos instrument on the 2.1-meter Otto Struve Telescope at McDonald Observatory. Credit: K. Williams/T. Jones/McDonald Observatory
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AstronomicalPulsations of a Carbon White Dwarf (color)
This 'light curve' shows the changes in light output over time, or 'pulsations,' of the first-discovered pulsating carbon white dwarf, as measured by the Argos instrument on the 2.1-meter Otto Struve Telescope at McDonald Observatory. Credit: K. Williams/T. Jones/McDonald Observatory
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AstronomicalInteracting Galaxies from GEMS (4 of 4)
One of the many interacting galaxy pairs seen by the GEMS survey with the Hubble Space Telescope. Credit: S. Jogee/UT-Austin/GEMS Collaboration/STScI/NASA
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AstronomicalInteracting Galaxies from GEMS (3 of 4)
One of the many interacting galaxy pairs seen by the GEMS survey with the Hubble Space Telescope. Credit: S. Jogee/UT-Austin/GEMS Collaboration/STScI/NASA
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AstronomicalInteracting Galaxies from GEMS (2 of 4)
One of the many interacting galaxy pairs seen by the GEMS survey with the Hubble Space Telescope. Credit: S. Jogee/UT-Austin/GEMS Collaboration/STScI/NASA
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AstronomicalInteracting Galaxies from GEMS (1 of 4)
One of the many interacting galaxy pairs seen by the GEMS survey with the Hubble Space Telescope. Credit: S. Jogee/UT-Austin/GEMS Collaboration/STScI/NASA
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Astronomical