Deep-Sky Object
H II Region
A nursery of stars wrapped in ionised hydrogen.
Large clouds of ionised hydrogen surrounding hot young O and B stars. The Orion Nebula is the nearest example.
Overview
Large clouds of ionised hydrogen surrounding hot young O and B stars. The Orion Nebula is the nearest example.
See also
Orion Nebula (M42)
A stellar nursery glowing in Orion's sword.
Emission Nebula
A glowing cloud of ionised gas.
Dark Nebula
A cold cloud blocking the stars behind it.
Molecular Cloud
A cold cradle where stars are born.
OB Association
A loose group of hot massive stars.
Stellar Association
A loose grouping of young related stars.