In 2001, a bizarre red rain showered India’s southern state of Kerala. Godfrey Louis, a physicist now in Cochin University of Science and Technology’s astrobiology department, decided to collect samples and take a closer electron-microscope look. He noticed some particles in the rainwater that looked like biological cells, but when he went looking for DNA, he found none. That enticingly strange result led Louis to speculate that he had found extraterrestrial bacteria.
The new paper (pdf) appears in Arxiv.org, not a peer-reviewed journal. But it repeats earlier work by Louis and a collaborator that they say shows the cell-like particles can survive and grow at high temperatures that would kill most life as we know it (around 250 degrees Fahrenheit). At room temperature, particles appear as inert as, well, odd looking red rain dirt.