Stardust Found in Antarctic Snow

Scientists from Australia have found stardust in some snow in Antarctica.

They have discovered large amounts of a rare isotope not found on Earth.

It has been ruled out that the snow was made by humans.

Instead, it was brought to Earth by some type of falling rock.

Researchers say the source of iron-60 must be a supernova.

The iron-60 has a half-life of 2.6 million years.