Black hole week is in full swing, and to celebrate, NASA has explained how its next major astronomical instrument, the Nancy Grace Roman Space Telescope, will hunt for tiny black holes that date back to the Big Bang.
When we think of black holes, we tend to picture vast cosmic monsters like stellar-mass black holes with masses tens to hundreds of times that of the sun. We may even picture supermassive black holes with masses millions (or even billions) of times that of the sun sitting at the hearts of galaxies and dominating their surroundings.
