Andromeda, Hubble Space Telescope and dwarf galaxies

The Andromeda constellation is one of the 88 modern constellations and should not be confused with our neighbouring Andromeda ...
Hubble's study reveals Andromeda experienced major galactic collisions, unlike Milky Way. Its satellite galaxies show unusual ...
In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small ...
While the events observed around Sgr A* are dramatic, this black hole is not as active as some at the center of other ...