Mexican astronomers running computer simulations believe that rocks blasted upward by the impact of giant meteorites hitting Earth at one time may have sailed past Jupiter and out of the solar system. The astronomers speculate that some of those rocks may have carried with them samples of Earth's lifeforms to seed terrestrial life on Mars and the moons of Jupiter.
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That rocks erupting from the impacts could have made it into space is not controversial. Astronomers think some of them could have gone fast enough to leave the Earth's gravity and even hit the moon and Venus. Meteorite impacts have occurred throughout the history of the Earth, including times when the Earth teemed with life: indeed, one of the most significant collisions, it is believed, wiped out the dinosaurs.
What is likely to be very controversial is the Mexican astronomers' theory that life on Earth may have hitch-hiked on the rocks. The theory is based on the notion that all life shares a common origin and spread throughout the cosmos, including Earth, traveling on meteors.