Saturn’s hexagon
Like a petulant adolescent, Saturn is sending out mixed signals … the northern and southern rotational variations also appear to change with the Saturnian seasons, and the hemispheres have actually swapped rates since the equinox crossing in August of 2009.
supermoon over frankfurt by stephan heinsius
A giant ring of black holes: Arp 147, a pair of interacting galaxies located about 430 million light years from Earth.
The Main Sequence
A Hertzsprung-Russell diagram plots the actual brightness (or absolute magnitude) of a star against its color index (represented as B-V). The main sequence is visible as a prominent diagonal band that runs from the upper left to the lower right. This plot shows 22,000 stars from the Hipparcos Catalogue together with 1,000 low-luminosity stars (red and white dwarfs) from the Gliese Catalogue of Nearby Stars. /via Wikipedia
