"The green color comes from the gas that comes off the comet," he said.
"There's a lot of ice on it and methane – it's like a dirty snowball and so when it goes around the sun, it melts … and it's a sticky glow. "
Lighting hours later flash over the air as the Earth passes through the 3200 Phaethon asteroid tail.
They will look stunning of the ground, but the stars fall only in the atmosphere of the Earth by small rocks that have broken off the asteroid before burning up.
"They are about sand grain size, or even small stones and they travel tens of thousands of kilometers per hour," said Dr Tucker.
Although observers need a pair of binoculars or telescope to hold the Christmas Comet, the meteoric shower will be visible anywhere in Australia, even big cities, as long as it's a clear night.
"It's very accessible, you do not need anything special, you just have the night sky," said Dr Tucker.
Sydney: Mainly cloudy and low left conditions, possible breaks.
Melbourne: A cloudy night with scattered beams.
Brisbane: Mostly cloudy. A great opportunity for showers to develop.
Adelaide: Square but possible breaks.
Perth: A very clear evening.
Hobart: Mostly cloudy conditions.
Canberra: Possible breaks but mostly cloudy.
Darwin: Relatively cloudy.