A primordial soup of complex organic chemicals that could be the precursors of life is cooked up very quickly after the birth of stars, new research suggests. Another international team has made calculations that suggest that life could have arisen on Mars and then been transferred to Earth by meteorites jolted away from the surface of Mars by asteroid impacts. Early in solar system history, it is also calculated that up a trillion Earth rocks were blasted into space and traveled to Mars. This means that life from Earth could have once seeded Mars. “Because of the heavy traffic between Earth and Mars, we couldn’t decide which came first,” Martian life on Earth, or the reverse, said Mileikowsky.