Zodiac Light Home

The Deep Sky Gallery

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Nebulas
Nebulas

Clusters
Clusters

Galaxies
Galaxies

Nebulas are vast thin volumes of gas swirling in space.  The gases in nebulae are excited by the radiation from nearby stars.  The gas re-radiates the energy at different characteristic blue, green, yellow or red wavelengths.  The color depends upon the composition of the gas in the nebula and the type and strength of the radiation it is receiving from its nearby stars.  For example the red light seen in many nebulas is caused by glowing Hydrogen. Clusters are groups of stars numbering from loose aggregations of a few dozen in loose clusters all the way up to Globular clusters which are huge concentrations of many thousands, or even a million stars.  Some globular clusters rival dwarf galaxies for size. Galaxies are home to many billions of stars swirling together about a bright central and mysterious core.  Galaxies contain many nebulae, clusters and probably even planets.  At the centre of every galaxy there is probably a huge black hole.

 

 

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