Teghaza 001, a Martian meteorite, reportedly dates back at least 4.1 billion years

Researchers dated the Martian meteorite Teghaza 001 to at least 4.1 billion years old, according to Scientific American’s account of a new Science paper. Earlier work from the same team found water-altered minerals; the outlet also describes trapped hydrogen as a sign that Mars was already losing much of its atmosphere. Elemental ratios resemble the southern highlands, but planetary scientist Anya Udry cautions that the rock’s exact Martian origin remains unclear.