Experts had confirmed a bright green glow which shot across the sky in WA was likely a meteor.
Video filmed by locals in Port Hedland, in the state's Pilbara region, showed the sky lit up with the ominous green object.
The ominous glow was also seen by people in parts of Victoria and South Australia.
Renee Sayers from Curtain University, which runs the meteor research group, Desert Fireball Network, believed it was only a small asteroid.
"It was a beautiful blazing fireball and we probably expect it about the size of a washing machine or a chair up in the upper atmosphere," she told 9News.
She added that researchers see them every night - though larger ones are only spotted a couple of times a year.
Earlier today, other astronomers said they believed it could have been Asteroid 2002 NN4, which was scheduled to pass Earth about 11.20pm yesterday.
That asteroid is estimated to be the size of six football fields, with estimated diameter of up to 570 metres, according to the Centre for Near Earth Object Studies.
Despite being clearly visible, the asteroid was about 5.2 million kilometres away from our planet, 13 times further away than the moon, NASA says, so there was no risk of it hitting the Earth.
NASA say these kinds of occurrences are pretty normal, with an asteroid estimated to be about the same size as 2002 NN4 passing us just last August, and experts at the time called it moderately sized.
The biggest known asteroid that orbits the sun is a whopping 33 kilometres long, Lindley Johnson of NASA's Planetary Defence Coordination Office told CNN last year.
Still, the probability of an asteroid actually hitting Earth is pretty slim -- occurring once every two or three centuries, Mr Johnson said at the time.
In 2013, a meteor just 17 metres in diameter broke through the Earth's atmosphere over Russia. The meteor didn't actually make impact with the planet, but the blast still injured more than 1000 people.
Being millions of kilometres away, that wasn't the case with 2002 NN4.
The next time 2002 NN4 will be anywhere near this close to the Earth will be in June 2029.