Australia's largest research observatory, which houses top telescopes from around the world, is surrounded by a "large and dangerous" bush fire.
New South Wales Rural Fire Service posted aerial images on Twitter showing the Siding Spring Observatory under threat from the uncontrolled bushfire on Sunday, as hundreds of firefighters battled blazes across the state.
Bushfires are continuing to rage in the south east region of Australia as emergency crews battle to control the fires.
Over 100 bushfires continuing to burn across south-east Australia after an extreme heatwave.
This image taken from Nasa's Aqua satellite captures the fires from space.
Air Crane helicopters which are used to fight fires in hard to access areas are being used to extinguish more than 100 wildfires in south-eastern Australia.
This footage shows water being sucked into a hose and dumped on a fire in New South Wales.
Australian fire crews are continuing to battle more than 100 wildfires in the state of New South Wales.
As extreme hot weather in the day has been hampering the operation to tackle the fires, efforts have also been increased overnight.
George Hancock of the Rural Fire Service said: "It's quite a dangerous time of the night but a very effective time of the night too that we can carry out a lot of this type of work".
Firefighters have also said they are confident they can stop a bushfire reaching a former military range scattered with unexploded bombs, the Australia Broadcasting Corporation reports.
The New South Wales Rural Fire Service in Australia are currently coordinating around 100 aircraft to keep control of wildfires in the area.
Cooler temperatures yesterday provided some respite from the fires, with only two areas now under a total fire ban.
- North Western
- Northern Slopes
Fire crews are warning that the crisis sin't over, with the extensive heatwave to continue over the next few days.
The Australian grandparents who sheltered with their five young grandchildren in the sea as wildfires ravaged their home have been describing their incredible escape.
Tim and Tammy Holmes initially took shelter on their jetty, and when it went up in flames the pair took all five of the children, including three who could not swim, into the ocean.
Bonnie Walker, the children's parents said she was had braced to lose her children and parents. ITV News correspondent Paul Davies reports:
Australia's extreme and extensive heatwave will continue over the next few days. Four months of dry, hot conditions with a stationary high pressure over the continent and failure of northern monsoon rains have aided the intense heat.
With conditions a little more comfortable during the last day or so, temperatures are set to soar again into the weekend with highs of 45-50C possible across the interior. The record temperature of 51C set in 1960 could well be broken.
The intense heat, tinder dry conditions and brisk winds will exacerbate the already raging forest fires. Added to this, Cyclone Narelle is also set to make landfall on the northwest Cape by the weekend bringing gale force winds and thunderstorms.
Record temperatures which led wildfires across eastern, northern and central of Australia have cooled, helping firefighters tackling the blazes.
In New South Wales, Australia's most populated state, more than 130 fires are still burning.
New South Wales Premier, Barry O'Farrell, said: ""The crisis isn't over. This fire is still alive."
Meanwhile in Victoria, a 128-year-old historic home, Carngham Station, was burned to the ground after it caught fire from an ember.