A meteorite reportedly the size of a house fell on the NSW south coast overnight, exploding in a bright flash, police said today.

A driver on the Hume Highway shortly after 9pm (AEST) near Menangle reported an object the size of a house falling from the sky.

The object fell east of the Hume Highway, possibly in an escarpment near the top of a hill at Bulli, police were told.

The meteorite was described as glowing silver in colour and similar to an artillery shell when it exploded with a bright flash on impact.

Workers at the Sydney Airport Tower said they saw a meteorite about 9pm, police said.

No other reports were received by police and extensive police patrols of the area did not turn up the space debris.

What a story this would make with some imagination - you could certainly write a book about this ... and as I write are they burying themselves deep ...