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APOD
Astronomy Picture of the Day
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
Nearby Spiral M33
Explanation: Spiral galaxy M33 is a mid-sized member of our Local Group of Galaxies . M33 is also called the Triangulum Galaxy for the constellation in which it resides. About four times smaller (in radius) than our Milky Way Galaxy and the Andromeda Galaxy (M31), it is much larger than the many of the local dwarf spheroidal galaxies. M33 's proximity to M31 causes it to be thought by some to be a satellite galaxy of this more massive galaxy. M33 's proximity to our Milky Way Galaxy causes it to appear more than twice the angular size of the Full Moon , and be visible with a good pair of binoculars.
| Date | December 14, 2004 |
|---|---|
| Credit | Credit and Copyright: Richard Hammar |
| Authors & editors: | Robert Nemiroff (MTU) & Jerry Bonnell (UMCP) |
| A service of: |
ASD at NASA / GSFC, NASA Science Activation & Michigan Tech. U. |