Page 19 - Ultimate Visual Dictionary (DK)

NEBULAE AND STAR CLUSTERS

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