Nov. 20 (UPI) -- Astrobiologists suggest the building blocks of life could be carried between worlds by streams of space dust. In fact, life-giving dust may have delivered the biological particles that first sparked life on Earth.
Researchers at the University of Edinburgh argue interplanetary dust could collide with tiny organisms or biological particles in Earth's upper atmosphere with enough energy to kick them into space. These organisms or life-bearing particles could be carried from planet to planet, or possibly even to another solar system.