Page 19 - (DK) The Ultimate Visual Dictionary 2nd Ed.

NEBULAE AND STAR CLUSTERS

ORION NEBULA (DIFFUSE EMISSION NEBULA)
Glowing Gas cloud
cloud of dust
and hydrogen emitting
light due to
gas forming
part of Orion ultraviolet
radiation from
Nebula
the four young
Trapezium stars
Dust cloud

Trapezium
(group of four
young stars)
Green light
from hot,
ionized
oxygen gas
Glowing
Red light filament of
from hot, hot, ionized
ionized hydrogen gas
hydrogen gas

VELA SUPERNOVA REMNANT
Supernova
remnant (gas
shell consisting
of outer layers
HELIX NEBULA (PLANETARY NEBULA)
of star thrown
off in
supernova
Planetary nebula
(gas shell expanding explosion)
outward from dying
stellar core)
Hydrogen gas
emitting red
Core remnant with light due to
surface temperature being heated
of about 180,000°F by supernova
(100,000°C) explosion
Red light from
hot, ionized
hydrogen gas

Blue-green light from Glowing
hot, ionized oxygen filament of
and nitrogen gases hot, ionized
hydrogen gas

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