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
December 12, 1995
Shapley 1: An Annular Planetary Nebula
Telescope photograph by David Malin
This strange structure is what can result when a normal
runs out of
in its core. At that time, the centre condenses into a
white dwarf while the outer atmospheric layers are
expelled into space and appear as a
planetary nebula, designated Shapley 1 after
the famous astronomer
Harlow Shapley, has a very apparent annular ring like
structure. Although some of these nebula appear like planets on the sky
(hence their name), they actually surround stars far outside our solar system.
Tomorrow's picture: A Delta Rocket Launches
| About APOD
Authors & editors:
NASA Technical Rep.:
Specific rights apply.
A service of:
Michigan Tech. U.