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Hoag's Object in the constellation Serpens. A ring galaxy in which there is a central core of older yellow stars with a ring of young blue stars. The formation of a galaxy like this probably involves a galactic collision, but it's still a mystery. If you look closely at the gap, you can see another ring galaxy in the distance.(Credit: R. Lucas (STScI/AURA), Hubble Heritage Team, NASA) Mona Evans, "Cosmic Collisions"

Twenty five years ago, in 1987, the brightest supernova in recent history was seen in the Large Magellanic Cloud. At the center is an object central to the remains of the violent stellar explosion. Surrounding the center are curious outer rings appearing as a flattened figure 8. The Hubble Telescope monitors the curious rings every few years, their origin remains a mystery. Speculation of the rings includes beamed jets emanating from an otherwise hidden neutron star left over from the…

Using ESO's Very Large Telescope, an international team of astronomers has discovered a stunning rare case of a triple merger of galaxies. This system, which astronomers have dubbed 'The Bird' - although it also bears resemblance with a cosmic Tinker Bell - is composed of two massive spiral galaxies and a third irregular galaxy.

Largest water reservoir discovered in black hole. The reservoir holds as much as 140 trillion oceans, or more than 4,000 times more than exists in the entire Milky Way. It exists as vapour spread across hundreds of light years. While water has been found across much of the universe previously, this is interesting because of the fact this reservoir is 12 billion light years away, meaning that this water existed when the universe was only 1.6 billion years old.

Located 500 million light-years away in the constellation Sculptor, the galaxy looks like a wagon wheel. The galaxy's nucleus is the bright object in the center of the image; the spoke-like structures are wisps of material connecting the nucleus to the outer ring of young stars. The galaxy's unusual configuration was created by a nearly head-on collision with a smaller galaxy about 200 million years ago.

The Andromeda Galaxy (also known as M31), 2.5 million light-years away and spanning some 260,000 light-years. It took 11 different image fields from the Galaxy Evolution Explorer (GALEX) satellite's telescope to produce this portrait of the spiral galaxy in ultraviolet light.