This video should give you all the key words and terms needed to get yourself brought up to speed with the latest in xenobiology.
If the idea of life elsewhere shocks you, do not click play. This is paradigm shift material. Exquisite Fossil Diatoms have been discovered in space rocks and at the end of this video you will have very little doubts as to what is out there.
All of the questions you might have about these fossils and their provenance and origin are addressed in the video, it is a thorough briefing
https://www.youtube.com/watch?v=nCZDqOrkXb8
recommended reading:
https://buckingham.ac.uk/wp-content/uploads/2011/09/Polonnaruwa-meteorite.pdf
(https://i.imgur.com/OWXCyRw.png)
(https://i.imgur.com/nfOXilK.png)
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Here is the follow-up talk to the presentation
It's good:
https://www.youtube.com/watch?v=qpxA9_iEXgM