A green space voyager that may have last been seen by the Neanderthals is making a return 50,000 years on and can now been seen from Australia. 
Scientists say the Green Comet, named because of its emerald glow, is only one kilometre across but its gaseous tail is as wide as Australia.
The closest it has come to earth is 42 million kilometres which is why it won’t be putting on a stunning light show in the night sky when best seen from Australia between Sunday and Saturday.
Officially known as Comet C/2022 E3 (ZTF), it was only discovered in March 2022 by astronomers using the wide-field survey camera at the Zwicky Transient Facility in California.   …