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Distant dueling giants reach resonance

Looming collisions set on course

Theorised planet, fifth in the sequence

Scattering comets, spirals to the Sun

Cosmic silver bullets

Late heavy bombardment

A hundred million years of hell on Earth

Kinetic pure energy transposed to heat

Afflicts on a scale never since seen

Gateway between natural war and peace

Sterilised to wipe the slate clean

Lunar cataclysm that scarred her face

Apollo found the traces of evidence

That might point to Panspermian genesis

The veil between Hadean and Archean

Epochs defined, destined to survive

Most of the content is taken from the BBC documentary series "Wonders of Life" presented via a wistful stare into the distance by Professor Brian Cox. There is in fact a section specifically on the Late Heavy Bombardment.

We did not seek permission to use the footage...but hope that the mutual promotion of science and reason is sufficient justification in this case. Monsterworks is a never-turned-a-profit organisation.