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Researchers made the staggering claim after "proving" that ribose, the basic sugar from which much of our DNA is composed, is able to form on a comet.

Scientists from the Institut d’Astrophysique Spatiale, and the Institut de Chimie de Nice, claim to have discovered that the nucleic acids that make up our DNA, are formed primarily from ribose, and therefore may not be originally from Earth.

At the formation of our solar system, the young Sun was surrounded by a circumstellar disc of gas and dust. 

Planets then formed by aggregation of these small, frozen bodies that met violently and merged, bringing many chemical compounds.

This is certainly not a new idea. The idea of "panspermia" has been around for decades. To read more, click here.