Astronomers have made a surprising discovery that challenges current theories of galaxy formation. A colossal disk-shaped galaxy, nicknamed the "Big Wheel," has been found just two billion years after ...

On the left is a composite image of the Triangulum galaxy, made by overlaying individual images taken by the Hubble Space Telescope as part of the PHATTER survey. Distributions of old and young ...

With the interactions of the four largest galaxies inside the local group (the Milky Way, Andromeda, the Triangulum galaxy and the Large Magellanic Cloud) taken into account, the researchers found ...