A tiny chunk of rock probably no larger than a marble lit up the sky for hundreds of kilometres over Victoria on Tuesday night.

People across the state reported seeing the meteor flying in the south-western sky about 12 minutes past 11 on Tuesday night, before detonating in an explosion that filled the sky.

Perry Vlahos from the Astronomical Society of Victoria has been fielding calls all day from people who saw the flash, some from as far away as South Australia.

Firefighters and police also received several panicked calls about "a fire in the sky", a spokesman said.