This is an image of comet Lovejoy captured from Australia. Unfortunately, every night where I live has been buried under a continual layer of rain clouds.
Comet Lovejoy C/2014 Q2 lights up the sky over Australia (Copyright: Phil Hart photography)
The comet, which was discovered in 2014 by amateur Australian astronomer Terry Lovejoy, comes from the Oort Cloud, a distant halo of icy bodies and frozen debris at the outer edge of the solar system.
It last visited the inner solar system about 11,500 years ago and is not expected to return for another 8000 years.
The coma's green glow is caused by carbon molecules, which are made to fluoresce by ultraviolet radiation from the Sun. Comets usually have two tails—a dust tail, and an ion tail, but Lovejoy isn't producing enough dust to generate a visible dust tail.
Its long ion gas tail is tinted blue because of fluorescing carbon monoxide ions. The limited dust which is flowing through the comet's coma and tail reflects sunlight, producing a pale yellowish white glow.
This image of Comet Lovejoy was taken by Australian astrophotographer Phil Hart using an 8-inch telescope equipped with a modified digital camera on a special tracking mount which adjusts for the Earth's rotation.
—And this is the bloke who discovered it in August 2014:
Terry Lovejoy, who discovered comet Lovejoy that survived a death dive