[DOC] [TLE] Milky Way Galaxy - Wikipedia [PAR] The Milky Way is the galaxy that contains our Solar System. Its name "milky" is 
derived from its ... Following the 1920 Great Debate between the astronomers 
Harlow Shapley and Heber ... The Milky Way is a barred spiral galaxy that has a 
diameter usually .... Andromeda Galaxy contains an estimated one trillion (1012) 
stars. [DOC] [TLE] Spiral galaxy - Wikipedia [PAR] A spiral galaxy is a certain kind of galaxy originally described by Edwin Hubble in 
his 1936 work The Realm of the Nebulae and, as such, forms part of the Hubble 
sequence. Spiral galaxies consist of a flat, rotating disc containing stars, gas and 
dust, ... These are surrounded by a much fainter halo of stars, many of which 
reside... [DOC] [TLE] The Mystery of the Missing Mass - NASA History Homepage [PAR] The problem of the missing mass has gotten to the point where it is more than just 
... the stars and gas to the outer regions of spiral galaxies, they have found that 
the stars ... toward the center of the galaxy but must be [160] distributed in some 
dark, .... In addition, heavy elements ejected from these stars prior to their 
collapse... [DOC] [TLE] HubbleSite - NewsCenter - Hubble Reveals Stellar Fireworks ... [PAR] Oct 21, 1997 ... The Milky Way and the Andromeda galaxy are approaching each other with a ... 
years to fully run its course, so it will be hard for any one civilization, like ours, ... 
Most of these stars will be in brilliant blue clusters, many of them 100 times ... 
They would have no clue that there were once two majestic spiral... [DOC] [TLE] galaxy facts, information, pictures | Encyclopedia.com articles about ... [PAR] Get information, facts, and pictures about galaxy at Encyclopedia.com. ... that a 
black hole, the remains of a massive star, lies at the center of many galaxies. ... 
Black hole: The remains of a massive star that has burned out its nuclear fuel and 
collapsed ... The Milky Way and nearby Andromeda galaxy are both spiral 
shaped. [DOC] [TLE] Galaxy - examples, body, process, Earth, law, form, energy, gas ... [PAR] Many scientists now believe that a black hole, the remains of a massive star, lies 
at the ... and to the left of Andromeda, is one of its two dwarf elliptical satellite 
galaxies, M32 (NGC 221). ... Dark matter: Unseen matter that has a gravitational 
effect on the motions of ... From this nucleus or center, arms spiral out like a 
pinwheel. [DOC] [TLE] Ten things you don't know about the Milky Way Galaxy - Bad ... [PAR] Mar 12, 2008 ... So let's see if these really are Ten Things You Don't Know About the Milky Way 
Galaxy. ... Astronomers call this block a bar, and, you guessed it: we have one. ... 
It's thought now that a supermassive black hole in the center of a galaxy ... but the 
number of stars in the spiral arms of our galaxy isn't really very... [DOC] [TLE] Milky Way Galaxy Has Four Spiral Arms, New Study Confirms ... [PAR] Dec 29, 2013 ... A 12-year study has confirmed that our Milky Way Galaxy has four ... The Milky 
Way is our galactic home and studying its structure gives us a ... longer than 
massive stars and rotate around our Galaxy many times, ... Astronomy ... Well 
he's right that these spiral arms will likely cease to exist once we collide. [DOC] [TLE] galaxy - Types of galaxies | astronomy | Britannica.com [PAR] Apr 13, 2016 ... Furthermore, many elliptical galaxies have slowly varying ellipticity, with ... galaxy 
at its centre, with surrounding hoops of gas, dust, and stars ... These normal 
spirals have narrow, tightly wound arms, which ... This is the most familiar type of 
Sb galaxy and is best exemplified by the giant Andromeda Galaxy. [DOC] [TLE] Messier 31: Andromeda Galaxy | Messier Objects [PAR] Apr 28, 2015 ... The Andromeda Galaxy is one of the most distant deep sky objects visible to ... 
The Andromeda Galaxy contains a trillion

Question: Many astronomers believe the Great Andromeda spiral galaxy has one of these "dark" collapsed stars at its center
Answer: black hole