Holly Day writes

Drift   

The astronaut drifts, or stays perfectly still, or is yanked

thousands of miles a minute through space -- it’s hard to tell

because it’s space, and all three scenarios are a possibility.

It’s only when the body collides with something solid

can one tell how fast the astronaut is moving

or how fast the object hitting the white-suited figure is.

Until collision, the white-suited body will continue

still or drifting or speeding through space, frozen and perfect

for thousands of years, or maybe there is just enough oxygen

left in the suit to allow the microbes that cause decay to continue

breaking the body down until there is nothing

but the clean, white eye sockets of a skull staring through the glass

or perhaps the organisms will live only long enough to collapse

the eyes inward, to stretch the skin gaunt, before asphyxiating themselves

or perhaps some combination of time and temperature

the fluctuating gravities of passing comets and nearby planets

will cause the body to disintegrate under forces we know nothing about

rendering the astronaut to a boot full of dust

glittering particles indistinguishable from the stuff of stars. 

Dead Astronaut -- Christopher Warren