Astronomical

Three Generations of Solar Cameras

These views of the Sun's full disk allow a comparison of three generations of solar cameras on McDonald Observatory's solar viewing system, from the original Overcash camera (smallest solar disk), to the upgrade to the first Semmes camera (middle disk), to the most recent Semmes camera upgrade (largest disk). The new camera's maximum resolution of the full solar disk has provided an astonishing improvement in size and clarity. (Kevin Mace/McDonald Observatory)

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Astronomical

SDO vs. McDonald Solar Camera

These images of a sunspot group viewed in white light were both taken on December 26, 2015. At left, the view from the space-based Solar Dynamics Observatory (SDO). At right, the view from McDonald Observatory's recently upgraded solar viewing system. The two images are are surprisingly comparable. (SDO/NASA, Kevin Mace/McDonald Observatory)

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Astronomical

Birth of a Blue Straggler

Left: A normal star in a binary system gravitationally pulls in matter from an aging companion star that has swelled to a bloated red giant that has expanded to a few hundred times of its original size. Right: After a couple hundred million years the red giant star has burned out and collapsed to the white dwarf that shines intensely in ultraviolet wavelengths. The companion star has bulked up on the hydrogen siphoned off of the red giant star to become much hotter, brighter and bluer than it was previously. Credit: NASA/ESA, A. Feild (STScI)

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Astronomical

Galaxies in HST's CANDELS GOODS-South Field

This image shows a region of the CANDELS GOODS-South field, which is one of the fields used in this study. This image combines data taken from Hubble Space Telescope's optical and near-infrared cameras, and contains galaxies at a range of distances. The larger galaxies are relatively close by, while the smallest specks hail from the earlier universe.  Some of the smallest dots in this image are those used in this study; their light is coming from 0.5 to 1.5 billion years after the Big Bang.

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Astronomical

White Dwarf Outburst

The regular brightness pulsations (red) of white dwarf star PG1149+057 are visibly affected by an outburst (green). Such outbursts have been detected in two pulsating white dwarfs to date, and astronomers plan to hunt for more examples. (Credit: J.J. Hermes/Univ. of Warwick/NASA) 

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Astronomical

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