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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.
The Millennium that Defines Universe
Explanation: Welcome to millennium three . During millennium two , humanity continually redefined its concept of “Universe”: first as spheres centered on the Earth , in mid-millennium as the Solar System , a few centuries ago as the Galaxy , and within the last century as the matter emanating from the Big Bang . During millennium three humanity may hope to discover alien life , to understand the geometry and composition of our present concept of Universe , and even to travel through this Universe . Whatever our accomplishments , humanity will surely find adventure and discovery in the space above and beyond , and possibly define the surrounding Universe in ways and colors we cannot yet imagine by the threshold of millennium four .
| Date | January 1, 2001 |
|---|---|
| Credit |
Credit: Camille Flammarion ; Courtesy: HSC , U. Oklahoma ; Digitization: K. Magruder ( OU ); Coloring: R. J. Nemiroff ( Michigan Tech ) |
| Authors & editors: | Robert Nemiroff (MTU) & Jerry Bonnell (UMCP) |
| A service of: |
ASD at NASA / GSFC, NASA Science Activation & Michigan Tech. U. |