Primordial black holes are intriguing candidates for dark matter, but many of their mass ranges remain untested. In a new study, two methods are proposed to search for such objects within the Solar System: the first looks for distortions in pulsar signals caused by asteroid-mass black holes; the second detects radiation flares from interactions between planet-like black holes and Kuiper Belt objects. These approaches, like sensors for an unseen presence, pave the way to study masses beyond the reach of cosmological observations.
The universe is full of invisible mass—dark matter. One hypothesis: it's made of tiny black holes born in the Big Bang. With the mass of an asteroid and smaller than an atom, they slip through planets unnoticed. Stephen Hawking back in the 1970s suggested such holes could explode, but they've never been seen.
Now astronomers have figured out how to track them down. Flying past a pulsar—a cosmic lighthouse with a perfectly steady rhythm of radio pulses—such a hole would gravitationally disturb its 'ticking'. A network of gravitational wave detectors would pick up this glitch. The second trail: a collision with an icy body beyond Neptune's orbit. The impact would heat gas to a glow, flashing for a split second brighter than the full Moon, like a signal bonfire.
These methods for the first time allow us to catch dark matter right in the Solar System, turning an invisible phantom into prey.
🎯 A black hole with the mass of an asteroid is compressed to smaller than an atomic nucleus—it would pierce through Earth without touching a single atom.
🎬 In Larry Niven's story 'The Hole Man', a microscopic black hole falls on Mars—much like in the real hunt for hidden things.