The ANDROMEDA Galaxy is a spiral galaxy located 2.5 million light years from Earth. It is the nearest major galaxy to Earth and was named after the mythological princess Andromeda.
Before it was discovered as a galaxy, the Andromeda Galaxy was thought to be a nebula and was referred to as the Great Andromeda Nebula. It contains one trillion stars- twice the number of stars in the Milky Way.
The Milky Way Galaxy and the Andromeda Galaxy are expected to collide in 3.75 billion years. This collision will result in one giant elliptical galaxy. Since everything in each of the galaxies are fairly spaced out, it is unlikely that there will be any collisions between stars. It is thought that some stars and systems will be ejected during the collision, our solar system included. The probability of this happening right now is pretty low, but it is a possibility. The remaining galaxy after the collision has been nicknamed Milkomeda (a merger between the two existing names).
It is believed that another galaxy, the Triangulum Galaxy, will also participate in this collision. It is thought that it will end up orbiting the new Milkomeda galaxy and then eventually collide with it. It is also thought that the Andromeda Galaxy has already undergone a collision with at least one other galaxy in the past.
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Comet PanSTARRS in the Southern Fish : Now approaching our fair planet this Comet PanSTARRS , will be affected by the light of a nearly Full Moon, though. Still the comets pretty green coma is about the apparent size of the Full Moon in this telescopic portrait, captured on June 12 from the southern hemispheres Siding Spring Observatory. The deep image also follows a broad, whitish dust tail up and toward the left in the frame, sweeping away from the Sun and trailing behind the comets orbit. Buffeted by the solar wind, a fainter, narrow ion tail extends horizontally toward the right. On the left edge, the brightest star is bluish Iota Piscis Austrini. Shining at about fourth magnitude, that star is visible to the unaided eye in the constellation of the Southern Fish. via NASA