n-a-s-a:

IC 4592: A Blue Horsehead

Credit & Copyright: Rogelio Bernal Andreo 

the-star-stuff:

ALBERT EINSTEIN: The important thing

Credit: Gavin Aung Than

mydarkenedeyes:

Aldous Massie

n-a-s-a:

M31: The Andromeda Galaxy

Credit & Copyright: Robert Gendler 

n-a-s-a:

Elusive Jellyfish Nebula

Credit & Copyright: Gerhard Bachmayer 

n-a-s-a:

M97: The Owl Nebula

Credit & Copyright: Keith Quattrocchi 

raneynickelcatalyst:

Animation of cortical spreading depression. Cortical spreading depression is a wave of electrophysiological hyperactivity followed by a wave of inhibition, usually in the visual cortex.Increased extracellular potassium ion concentration and excitatory glutamate contribute to the initiation and propagation of cortical spreading depression, which is the underlying cause of migraine aura.

source: wikipedia

ikenbot:

A Hole in Mars

Credit: NASA, JPL, U. Arizona

Back in 2007, black spots were discovered on Mars that are so dark that nothing inside can be seen. Quite possibly, the spots are entrances to deep underground caves capable of protecting Martian life, were it to exist.

The unusual hole pictured above was found on the slopes of the giant Martian volcano Arsia Mons. The above image was captured three weeks ago by the HiRISE instrument onboard the Mars Reconnaissance Orbiter currently circling Mars.

The holes were originally identified on lower resolution images from the Mars Odyssey spacecraft, The above hole is about the size of a football field and is so deep that it is completely unilluminated by the Sun. Such holes and underground caves might be prime targets for future spacecraft, robots, and even the next generation of human interplanetary explorers.