Since the beginning of astronomy, humans have been obsessed with extraterrestrial life. Much of Mars' scientific focus is on answering this question, as there are hints it once had microbial life.
You can study Mars without going there. 11 million years ago, a cluster of Martian meteorites called the nakhlites struck Earth, likely propelled by a Mars impact that sent debris into the solar system
Josefin Martell, a doctoral student at Lund University, has been studying these rocks.
Martell's team isn't looking for biosignatures in space debris, but meteorites reveal life's essential prerequisite on Mars.
Martell says investigating how much one nakhlite came in contact with water on Mars could answer whether life ever existed there.
"A meteorite impact 630 million years ago likely melted underground ice, causing the reaction. That doesn't mean life couldn't have existed elsewhere or at other times on Mars "Explained Martell.
The international team found there wasn't enough water to support life. Without water, we couldn't live.
Was there enough water on Mars for life? Erik Asphaug of the University of Arizona has theorised that. Mars' climate fluctuations and lack of atmosphere slowly turned it into a desert planet.