We review our current understanding of the internal dynamical properties of the dwarf spheroidal galaxies surrounding the Milky Way. These are the most dark matter dominated galaxies, and as such may be considered ideal laboratories to test the current concordance cosmological model, and in particular...
Surrounding the galaxy for thousand and thousand of light years is space.At great distances,however,billions of other galaxies are scattered.These galaxies are of many shapes and sizes.The Milky Way Galaxy is shaped like a spiral(螺旋型)disk.Other galaxies have been found to be shaped like ...
This led to the conclusion that there are a factor of 10 more galaxies in a given volume of space when the universe was a few billion years old compared with today. Most of these galaxies are low mass systems with masses similar to those of the satellite galaxies surrounding the Milky Way...
Local Group, in astronomy, the group of more than 20 galaxies to which the Milky Way Galaxy belongs. About half are elliptical galaxies, with the remainder being of the spiral or irregular type. As in other clusters of galaxies, members are probably kept
Ultra-faint dwarf galaxies have been discovered for the first time surrounding a Milky Way-sized galaxy, similar to those found within theMilky Way’s neighborhood. According to findings recently presented at the 241st meeting of the American Astronomical Society, the identification of the...
However, the dwarf galaxies surrounding the Milky Way, and their globular clusters, do not exhibit the Oosterhoff dichotomy. Moreover, the bulge globular clusters NGC 6388 and NGC 6441 cannot be easily assigned to one of the traditional Oosterhoff groups. We will discuss the implications of the ...
Stars and Galaxies Ssections 1 Observing the Universe 2 Evolution of Stars Lab Star Cluster Age 3 Galaxies and the Milky Way 4 Cosmology Lab Expansion of the Universe Colliding Galaxies These two spiral galaxies, known as "the mice," have been colliding for about 160 million years. Eventually...
These galaxies have an enormous dense region in the center and a flat disk surrounding it but no spiral arms. In the 1960’s numerous ring- and disk-shaped galaxies were discovered with all gradations of abundance of hot stars and dust. As far back as the 1930’s elliptical dwarf ...
The new observations with ESO’s VLT revealed several galaxies surrounding a supermassive black hole, all lying in a cosmic “spider’s web” of gas extending to over 300 times the size of the Milky Way. “The cosmic web filaments are like spider’s ...
However, another theory states that before that happens, the Milky Way couldcollide with a smaller satellite galaxycalled the Large Magellanic Cloud in around two billion years’ time. This theory states that the forces of the two colliding galaxies could spur the supermassive black hole at the ...