A recent TED-Ed lesson by Justin Dowd explains what comets are, and asks whether they could be the source of life on Earth. Dowd also proposes that if a comet started life on Earth, then comets may be capable of starting life on planets in other solar systems.
While comets were historically thought to be ill omens of war and famine, recent science has revealed that these celestial wonders actually contain amino acids, the building blocks of life on Earth. Justin Dowd explores the implications of this magnificent discovery.
