Carlos Ochagavia - Newton and the Quasi-Apple, 1975.
CHAINS KEEP US TOGETHER
At first glance, the dynamic of this striking galactic group seems obvious — the “bridge” of blue stars is connecting the upper galaxy to the bottom one. However, the lower galaxy is actually a distant object, and isn’t part of this interacting group known as Arp 194.
In the mess of stars and gas stirred up by gravitational interactions, the galactic nuclei of the top galaxies can be seen. They are on a collision, and their slow attraction is responsible for the long tidal tail full of young star superclusters. The blue stream of stars extends for about 100,000 light-years.
Arp 194 can be found about 600 million light-years from Earth in the constellation of Ursa Major.
Image: NASA, ESA and the Hubble Heritage Team (STScI/AURA)
Seeing a supernovae within hours of the explosion
For the first time ever, scientists have gathered direct evidence of a rare Wolf-Rayet star being linked to a specific type of stellar explosion known as a Type IIb supernova. Peter Nugent of the Lawrence Berkeley National Laboratory says they caught this star – a whopping 360 million light years away – just a few hours after it exploded.