Rotating a Galaxy


This animation illustrates the rotation rate of the Large Magellanic Cloud (LMC). Hubble Space Telescope observations have been used to determine that the central part of the LMC completes a rotation every 250 million years. It takes more than 10 million years for even the small amount of rotation illustrated in this video.

Video Credit: NASA

A Hermit Galaxy


UGC 4879 is an irregular dwarf galaxy. It is very isolated, which means that it has not interacted with any surrounding galaxies, making it an ideal laboratory for studying star formation uncomplicated such interactions. Studies of UGC 4879 have revealed a significant amount of star formation in the first 4-billion-years after the Big Bang, followed by a strange nine-billion-year lull in star formation which ended about 1-billion-years ago. That behavior is puzzling, and the solitary galaxy continues to provide ample study material for astronomers looking to understand the complex mysteries of starbirth throughout the Universe.

Image Credit: ESA / NASA