xaview:

Spiral Galaxy ESO 137-001 by NASA Goddard Photo and Video on Flickr.

The galaxy is zooming toward the upper right of this image, in between other galaxies in the Norma cluster located over 200 million light-years away. The road is harsh: intergalactic gas in the Norma cluster is sparse, but so hot at 180 million degrees Fahrenheit that it glows in X-rays.
The spiral plows through the seething intra-cluster gas so rapidly – at nearly 4.5 million miles per hour — that much of its own gas is caught and torn away. Astronomers call this “ram pressure stripping.” The galaxy’s stars remain intact due to the binding force of their gravity.
Tattered threads of gas, the blue jellyfish-tendrils trailing ESO 137-001 in the image, illustrate the process. Ram pressure has strung this gas away from its home in the spiral galaxy and out over intergalactic space. Once there, these strips of gas have erupted with young, massive stars, which are pumping out light in vivid blues and ultraviolet. The brown, smoky region near the center of the spiral is being pushed in a similar manner, although in this case it is small dust particles, and not gas, that are being dragged backwards by the intra-cluster medium.

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Credit: NASA/ESA/CXC
hella-space:

Saturn’s moon Enceladus. 
(photo courtesy of Cassini Imaging Team, SSI, JPL, ESA, NASA)
fishstickmonkey:

A thin solar prominence appeared above the Sun, then sprouted numerous streams of plasma back into the Sun before disappearing a day later (July 28-29, 2014). The prominence and its streams are being controlled by forces associated with strong magnetic fields beneath the prominence. These images were taken in extreme ultraviolet light. Credit: Solar Dynamics Observatory/NASA. (via SDO | Solar Dynamics Observatory)
tichoslapek:

Seen here is one of the more spectacular scenes of the Aurora Borealis that was photographed by one of the space station crew members aboard the International Space Station from an altitude of approximately 223 nautical miles. 
Image Credit: NASA