In Memoriam  

Comet C/2012 S1 (ISON)
Born 4.5 Billion BC, Fragmented Nov 28, 2013 (age 4.5-billion yrs old)
Born in a dusty and turbulent environment, comet ISON spent its early years being jostled and struck by siblings both large and small. Surviving a particularly violent first few million years, ISON retreated to the Oort Cloud, where it maintained a largely reclusive existence for nearly four billion years. But around 3-million B.C., a chance encounter with a passing star coerced ISON into undertaking a pioneering career as a Sungrazer. On September 21, 2012, ISON made itself known to us, and allowed us to catalog the most extraordinary part of its spectacular vocational calling.
Never one to follow convention, ISON lived a dynamic and unpredictable life, alternating between periods of quiet reflection and violent outburst. However, its toughened exterior belied a complex and delicate inner working that only now we are just beginning to understand. In late 2013, Comet ISON demonstrated not only its true beauty but a surprising turn of speed as it reached its career defining moment in the inner solar system. Tragically, on November 28, 2013, ISON’s tenacious ambition outweighed its ability, and our shining green candle in the solar wind began to burn out.
Survived by approximately several trillion siblings, Comet ISON leaves behind an unprecedented legacy for astronomers, and the eternal gratitude of an enthralled global audience. In ISON’s memory, donations are encouraged to your local astronomy club, observatory or charity that supports STEM and science outreach programs for children.

Credit: Karl Battams

Well. Pulsars. There are a lot of reasons why they seem so strange to us. Why is that so? Simply because we don’t understand them (and whoever says that’s not true is wrong cuz eve astrophysicists do not fully understand them). 
For example, they are about the size of an average city down here, but they rotate in crazy high-speed. This is just one of the many exotic things about pulsars.
Read more about them: 

Pic Credit by NASA/Goddard Space Flight Center

Found at #From Quarks to Quasars’ Fb.

Comet C/2012 S1 ISON in the Cor-2 images on the NASA STEREO Ahead spacecraft.
Image credit: NRL/NASA

NGC 7318 (also known asUGC 12099/UGC 12100 or HCG 92d/b) are a pair of collidinggalaxies about 300 million light-years away in the Constellation Pegasus. They are members of the famous Stephan’s Quintet. 
NGC 7318B has two optical arms emanating from the eastern part of the main body. Since these arms are similar morphologically to the tidal tails of merging galaxies such as NGC 4038/9, it is considered that NGC 7318B itself is a major merger with a retrograde orbit. In order to study the emission-line activity in the tidal arms of NGC 7318B, scientists took CCD narrow-band (Ha ON and OFF) images and then found a large-scale arc in Ha emission which traces closely the arms.

Credit: NASA, ESA, and the Hubble SM4 ERO Team

Merging NGC 2623  

NGC 2623 is really two galaxies that are becoming one. Seen to be in the final stages of a titanic galaxy merger, the pair lies some 300 million light-years distant toward the constellation Cancer.
The violent encounter between two galaxies that may have been similar to the Milky Way has produced widespread star formation near a luminous core and along eye-catching tidal tails. Filled with dust, gas, and young blue star clusters, the opposing tidal tails extend well over 50,000 light-years from the merged nucleus. Likely triggered by the merger, accretion by a supermassive black hole drives activity within the nuclear region.
The star formation and its active galactic nucleus make NGC 2623 bright across the spectrum. This sharp cosmic snapshot of NGC 2623 (aka Arp 243) is based on Hubble Legacy Archive image data that also reveals even more distant background galaxies scattered through the field of view.

Image Credit:  Hubble Legacy Archive, ESA, NASA; Processing  - Martin Pugh






No matter how long the slinky is, the bottom of the slinky will stay still (hover) until the top reaches it. Even if the slinky is over 1000 feet long.





…. *thinks*is it because the bottom is being pulled up at the same rate gravity is pulling it down, so it looks like it’s not moving? …I could be so completely wrong here 8l

You’re sort of right.
It’s just wave compression. Like in an explosion—the same reason you hear an explosion before the actual fire and shit hits you. In a slinky, the tension in the coils balances the force of gravity.
It happens with every falling object, but you don’t notice it—a slinky happens to be a really simple example of it.

Draw a straight line, and then continue it for the same length but deflected by an angle. If you continue doing this you will eventually return to roughly where you started, having drawn out an approximation to a circle. But what happens if you increase the angle of deflection by a fixed amount at each step? The curve will spiral in on itself as the deflection increases, and then spiral out when the deflection exceeds a half-turn. These spiral flourishes are called Euler spirals. [code] 
Here Are All The Alien Planets We Know Of...So Far


Very nice,finally a “map” of our universe :)