Ionised Hydrogen Collection

Optical image of the Eta Carinae Nebula
Eta Carinae Nebula. Optical image of the Eta Carinae Nebula (NGC 3372). It is an enormous cloud of hydrogen gas (an HII region) 300 light years across

Optical image of the Orion Nebula
Orion nebula. True-colour optical image of the great Orion nebula (M42 & M43, with NGC 1977 above) showing the fine strands of nebulosity in its outer reaches

Eta Carinae Nebula (NGC 3372), optical image. This nebula (a vast cloud of dust and gas) surrounds the variable star Eta Carinae

Swan and Eagle nebulae, optical image. These are both emisison nebulae, clouds of gas and dust glowing red as the hydrogen gas is ionised by radiation from hot young stars within them

Great Orion Nebula. Optical image of the emission nebulae M42 (right, large) and M43 (centre left, smaller) in the constellation Orion, together making up what is known as the Great Orion Nebula

Lagoon Nebula (M8), optical image. This nebula is an active region of star birth. It glows red as radiation from hot, newly formed stars ionises the surrounding hydrogen gas and causes it to glow

Trifid Nebula (M20, NGC 6514), optical image. Part of this nebula (cloud of gas and dust) glows red due to the ionisation of the hydrogen gas by the hot and bright stars born at its centre

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