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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 Dwarf Galaxy Leo I
Explanation: Leo I is a dwarf spheroidal galaxy in the Local Group of galaxies dominated by our Milky Way Galaxy and M31 . Leo I is thought to be the most distant of the eleven known small satellite galaxies orbiting our Milky Way Galaxy . Besides the LMC and the SMC , all Milky Way satellite galaxies are small, dim, dwarf spheroidals , including the closest galaxy - the Sagittarius Dwarf . Leo I is more distant than most of them, thought to be about 250 kpc away. Although very little star-forming gas is visible in Leo I , analysis of star ages shows that stars have formed as recently as a billion years ago.
| Date | October 3, 1999 |
|---|---|
| Credit | Credit & Copyright: David Malin (AAO), AATB |
| Authors & editors: | Robert Nemiroff (MTU) & Jerry Bonnell (UMCP) |
| A service of: |
ASD at NASA / GSFC, NASA Science Activation & Michigan Tech. U. |