The solar system was a dangerous place
Three billion years ago.
Protoplanets and icy debris
Hurtled to and fro.
Bent space with their masses,
Warped time as they flew,
Crusts networked with clues.
It didn’t require direct impact,
While those were common too,
Tidal encounters were all that it took
To rend a surface in two.
Life’s a system so fragile!
We worry if temperatures rise.
We’re shook by quakes and volcanoes,
But at least our crust won’t divide.
I’m glad to be born in the relative calm
Since planets have cleared out their orbits.
Snuggled within a biosphere,
Not hammered by what came before it.
By Kate Rauner
Thanks to space.com and Alice Quillen (University of Rochester in New York) et al for their new modeling study, which has been accepted for publication in the journal Icarus.