National

The comet pictured on March 29 this year.

Haunting photos document the path of a comet

They are the hauntingly beautiful black and white images that would not look out of place at any distinguished photo gallery. But they're the product of years of hard work by some of the world's top scientists and engineers.

Henri Mallard: Building the Sydney Harbour Bridge.

New exhibition showcases the birth of Sydney's Harbour Bridge

Henri Mallard, a Balmain local, was a photographic supply store worker when construction on what would become an iconic Australian landmark began – the Sydney Harbour Bridge, or the "coat hanger", as it would become affectionately known to locals.