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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.
Explanation:
What causes unusual knots of gas and dust in
planetary nebulas?
Seen previously in the
Ring Nebula, the
Helix
Nebula, and the
Eskimo Nebula,
the knots' existence was not predicted previously
and still not well understood.
Pictured above is a
Authors & editors:
Robert Nemiroff
(MTU) &
Jerry Bonnell (USRA)
Tomorrow's picture: MAP the Universe
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NASA Technical Rep.:
Jay Norris.
Specific rights apply.
A service of:
LHEA at
NASA /
GSFC
&
NASA SEU Edu. Forum
&
Michigan Tech. U.