Mass Extinctions In Earth's History? Poem by Terence George Craddock (Spectral Images and Images Of Light)

Wham bam life is virtually annihilated by an unexplained mass
extinction event first of several mass extinctions in Earth history?
What space time opera clears stage restarts weaves new life forms?

Scientists postulate increasingly look up to space
to explain seemingly clockwork mass extinctions
repeating happening since beginning of living time?

Is earth getting periodically belted by rogue space rocks asteroids?
Comets or is collision of passing neutron stars happening in space?
Too close for comfort to ensure survival of most capsule earth life?