Credit & Copyright: Judy Schmidt
Explanation:
What makes this cosmic
eye look so red?
Dust.
The featured
image
from the robotic
Spitzer Space Telescope
shows infrared light from the well-studied
Helix Nebula (NGC 7293) a mere
700 light-years away in the constellation of the Water Carrier
Aquarius.
The two light-year diameter shroud of
dust and gas around
a central white dwarf has long been considered an excellent
example of a
planetary
nebula, representing the final stages
in the evolution of a Sun-like star.
But the Spitzer data show
the nebula's
central star itself
is immersed in a surprisingly bright infrared glow.
Models
suggest the glow is produced by a dust debris
disk.
Even though the nebular material was ejected from the
star
many thousands of years ago,
the close-in dust could have been generated by collisions in
a reservoir of objects analogous to our own solar system's
Kuiper
Belt or cometary
Oort cloud.
Had the comet-like bodies formed in the distant planetary system,
they would have survived even the dramatic late stages of the star's
evolution.
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Publikacii s klyuchevymi slovami:
NGC 7293 - Helix Nebula - planetary nebula - Tumannost' Ulitka - Planetarnaya tumannost'
Publikacii so slovami: NGC 7293 - Helix Nebula - planetary nebula - Tumannost' Ulitka - Planetarnaya tumannost' | |
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