Meteorite thought to originate from Mars. The most famous of these
is known as ALH84001, which was found in Antarctica in 1984 (see first
photograph, below). Some researchers claim that microfossils are present
in this piece of rock (see second photograph: Transmission Electron Microscope
(TEM) image of ALH84001), which would prove that primitive life existed
on Mars at some point, however this has not been proven.