NASA says that maybe its Perseverance rover found signs of primitive life on Mars. There are lots of maybe's, and the fact is that nobody knows what that rover found. So, the rover found structures that seemed like ancient primitive bacteria. There are lots of theories that maybe a long time ago, planet Mars hosted primitive life. But the question is why remnants of those bacteria are not all around the red planet.
The fact is that Perseverance didn't find active bacteria, but in two stones were structures that seemed like remnants of ancient bacteria. The thing is that this kind of thing is always interesting. And if those remnants are only those stones. That makes things even more interesting. That means that those remnants are from somewhere else. And could some very primitive bacteria travel from, for example, Earth to Mars?
If those structures that Perseverance found are unique. That makes them interesting, even if they would not be ancient bacteria. Why at this point only is this type of mineral structure? What makes that mineral so unique? That is one of the most interesting questions on Mars research, even if there are no bacteria remnants in that stone.
The active lifeforms on planet Mars would be a sensation, even if those bacteria were some procaryotes. That thing proves that bacteria can form also on other planets. But if those structures are local, and they exist only in one place, that tells that they can come from somewhere else than from Mars. And one possibility could be Earth.
The ancient meteorites could throw water from oceans to the trajectory that takes those droplets to Mars. And that thing can explain why there are no bacteria remnants all over the planet. Another thing is that the planet Mars lost its shell at least twice. The comic bombardment in the young solar system could destroy all bacteria. Those meteorites could bring those bacteria remnants with them to Mars.
Or, maybe they came to Red Planet with some space probe that was not sterilized. The fact is that if there are no similar structures in other places on Mars, that makes Percevenrance's discovery very interesting, even if those formations are not bacteria.
https://www.jpl.nasa.gov/news/nasas-perseverance-rover-scientists-find-intriguing-mars-rock
https://science.nasa.gov/resource/signs-of-ancient-life-on-mars-heres-what-we-see-in-this-intriguing-rock-shorts/
https://www.science.org/content/article/nasa-says-it-found-possible-signs-life-mars-there-are-lot-maybes
.https://www.space.com/mars-rover-perseverance-possible-biosignature-astrobiologist-interview
https://en.wikipedia.org/wiki/Mars
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