Scientists have discovered what may be the earliest sign of life on Earth. Remains of nearly 3.5-billion-year-old bacteria has been found in north-west Australia.

Evidence of the never-before-seen bacteria was found in sedimentary rocks in the remote Pilbara region, home to the world's oldest rock formations.
"There was plenty of life from the 3.4 and 3.43 billion-year-old mark – this is pushing it further back," researcher David Wacey, from the University of Western Australia told The Telegraph.

While there are no cells from the microbially induced sedimentary structures (MISS) to be studied under the microscope, scientists observed the marks left behind created by large clusters of microbes.