The theory holds that ALH84001 was blasted away from the surface of Mars by the impact of another meteor about 17 million years ago, and fell on Earth roughly 13,000 years ago. These dates were established by a variety of radiometric dating techniques, including samarium–neodymium (Sm–Nd), rubidium–strontium (Rb–Sr), potassium–argon (K–Ar), and carbon-14 dating. Other meteorites that have potential biological markings have generated less interest because they do not contain rock from a "wet" Mars; ALH84001 is the only meteorite originating from a time period during which Mars is suspected to have supported liquid water.