Some astronomers hypothesize that asteroids and comets might shuttle biological matter between planets.
The mysterious object ‘Oumuamua passed through our solar system in 2017. Loeb has suggested it could have been sent by extraterrestrials. This article appeared in the June 2021 issue of Discover magazine as "Did Life Come From Space?" For more stories like this, become aLife, for all its complexities, has a simple commonality: It spreads. Plants, animals and bacteria have colonized almost every nook and cranny of our world.
“You can imagine small astronauts sitting inside this rock, surviving the journey,” says Avi Loeb, an astrophysicist at Harvard University and director of the school’s Institute for Theory and Computation. “Microbes could potentially move from one planet to another, from Mars to Earth, from Earth to Venus.”
If an asteroid or comet is large enough, microbes could be frozen deep within, Loeb says. That could protect them from radiation and the extreme temperatures that turn meteors into fireballs. After they explode onto the surface of a new world, these extraterrestrial colonists could begin to thrive.
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