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Recent Podcast
A Tour of SDSS J103842.59+484917.7
A Tour of SDSS J103842.59+484917.7
One hundred years ago this month, Albert Einstein published his theory of general relativity, one of the most important scientific achievements in the last century. (2015-11-24)

SDSS J1254+0846 in 60 Seconds

Narrator (Megan Watzke, CXC): Two quasars have been caught in the act of merging, thanks to this new image. Quasars are some of the brightest objects in the universe and are thought to be very distant galaxies with powerful black holes at their centers. This particular pair is located about 4.6 billion light years from Earth. In this image, X-rays from Chandra show the two quasars as bright blue circles. Optical data from a telescope in Chile show tidal tails fanning out from the two colliding galaxies. These tails contain streams of stars and gas that have been stripped by gravity as the two galaxies head towards their ultimate collision.

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