the Comet
The comet was ancient and big as a mountain. It drifted in the Milky Way in the deep cold black of interstellar space for eons. It was a timeless wanderer, a drifting piece of debris. It was the last mute witness of a catastrophe that had shattered the solar system of its birth. Deep within its armor of layers of frozen gases, the last progeny of that shattered world slept at near absolute zero.
Whether you might call it a comet or an asteroid would be a matter of opinion. Sure