In order to be able to locate it easily, we must find Pegasus’square, and from there, its location will be easier. , While at the initial time of its discovery it was hypothesized that the brighter portion of the double nucleus is the remnant of a small galaxy "cannibalized" by Andromeda Galaxy, this is no longer considered a viable explanation, largely because such a nucleus would have an exceedingly short lifetime due to tidal disruption by the central black hole. To support his claim of the Great Andromeda Nebula being, in fact, an external galaxy, Curtis also noted the appearance of dark lanes within Andromeda which resembled the dust clouds in our own galaxy, as well as historical observations of Andromeda Galaxy's significant Doppler shift. Measurements from the Gaia spacecraft have adjusted predictions for when and how the Milky Way will collide with the nearby Andromeda galaxy", "NASA's Hubble Shows Milky Way is Destined for Head-On Collision", "Messier Object Data, sorted by Apparent Visual Magnitude", Universal Natural History and Theory of the Heavens, Philosophical Transactions of the Royal Society of London, Publications of the Astronomical Society of the Pacific, "Radio emission from the Andromeda nebula", Annual Review of Astronomy and Astrophysics, "Hubble Finds Giant Halo Around the Andromeda Galaxy", "Milky Way ties with neighbour in galactic arms race", "The Andromeda Galaxy Is Not Bigger Than the Milky Way After All", "Hubble & Gaia Reveal Weight of the Milky Way: 1.5 Trillion Solar Masses", "The Latest Calculation of Milky Way's Mass Just Changed What We Know About Our Galaxy", "HubbleSite - NewsCenter - Hubble Finds Giant Halo Around the Andromeda Galaxy (05/07/2015) - The Full Story", "Hubble finds massive halo around the Andromeda Galaxy", "NASA's Hubble Finds Giant Halo Around the Andromeda Galaxy", "Astronomers Find Evidence of an Extreme Warp in the Stellar Disk of the Andromeda Galaxy", "The distribution and kinematics of neutral gas, HI region in M31", "ISO unveils the hidden rings of Andromeda", "Busted! , In 1912, Vesto Slipher used spectroscopy to measure the radial velocity of Andromeda with respect to our Solar System—the largest velocity yet measured, at 300 km/s (190 mi/s). The Andromeda Galaxy is the closest full-sized galaxy to the Milky Way Galaxy. If finally confirmed, it would be the first ever found extragalactic planet.  It has been measured approaching relative to the Sun at around 300 km/s (190 mi/s) as the Sun orbits around the center of the galaxy at a speed of approximately 225 km/s (140 mi/s). Scientists have been used several methods to estimate the distance of Andromeda from the earth. Baade identified two distinct populations of stars based on their metallicity, naming the young, high-velocity stars in the disk Type I and the older, red stars in the bulge Type II.  In 1764, Charles Messier cataloged Andromeda as object M31 and incorrectly credited Marius as the discoverer despite it being visible to the naked eye.  However, infrared data from the 2MASS survey and from the Spitzer Space Telescope showed that Andromeda is actually a barred spiral galaxy, like the Milky Way, with Andromeda's bar major axis oriented 55 degrees anti-clockwise from the disc major axis.. The planet was discovered by pixel-lensing to enhance the data. But the most distant known planets are “SWEEPS-11” and “SWEEPS-04”, which is around 27700 light-years away from us and exist in the Milky Way. The brighter concentration, designated as P1, is offset from the center of the galaxy. The Andromeda Galaxy is an object that we can appreciate easily, even though it is located 2.5 million light years away, with a direction pointing towards Andromeda constellation. This makes the Andromeda Galaxy one of about 100 observable blueshifted galaxies. According to recent studies, the Andromeda Galaxy lies in what in the Galaxy color–magnitude diagram is known as the "green valley," a region populated by galaxies like the Milky Way in transition from the "blue cloud" (galaxies actively forming new stars) to the "red sequence" (galaxies that lack star formation). Whereas the mass of the Sagittarius A* (supermassive black hole at Milky Way core) is around only 4 million solar masses. Globular clusters are the compact group of stars in a spherical shape that orbit a galactic core. The Galaxy M33 could be responsible for some warp in Andromeda's arms, though more precise distances and radial velocities are required. They are likely to have accreted and assimilated about 100–200 low-mass galaxies during the past 12 billion years. In 2005, a TRGB method (Tip of the Red Giant Branch) is used and find an estimated distance of around 2.56 ± 0.08 million light-years away. , There are approximately 460 globular clusters associated with the Andromeda Galaxy. ) Baade also discovered that there were two types of Cepheid variable stars, which resulted in a doubling of the distance estimate to Andromeda, as well as the remainder of the universe. The estimated distance of the Andromeda Galaxy from our own was doubled in 1953 when it was discovered that there is another, dimmer type of Cepheid variable star.  The radio results (similar mass to Milky Way galaxy) should be taken as likeliest as of 2018, although clearly this matter is still under active investigation by a number of research groups worldwide. ( 1,500 kly ) most galaxies andromeda galaxy planets a mass 6.34 times that of a collision is currently.... 35 ], there are approximately 460 globular clusters associated with the apparent! 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