How Many Black Holes Are In The Solar System?

Quick Overview

Dark matter, a mysterious invisible substance making up over 80% of the universe's mass, has eluded direct detection for decades. Scientists now propose that asteroid-mass primordial black holes (PBHs), formed in the early universe, could account for all dark matter. The Solar System, particularly the precise tracking of Mars's orbit, can serve as a giant detector for these PBHs, revealing their gravitational influence through minute shifts in planetary positions over time.

Key Points: Dark matter, comprising over 80% of the universe's mass, remains undetected despite decades of searching with advanced colliders and detectors. The most promising unexplored mass range for compact dark matter objects is between 10^17 and 10^23 grams, roughly the mass of asteroids. Primordial black holes (PBHs), formed in the early universe, are viable dark matter candidates within this asteroid-mass range, unlike regular asteroids or stellar black holes. The Solar System can act as a giant PBH detector, with asteroid-mass PBHs potentially passing through the inner Solar System as frequently as once per month to decade. Precise tracking of planetary orbits, particularly Mars, can reveal minute, meter-scale gravitational shifts caused by passing PBHs over years. Distinguishing PBH gravitational effects from those of known solar system objects or interstellar asteroids is possible due to their distinct trajectories and speeds. If observed orbital anomalies cannot be explained by known objects and the source is invisible to telescopes, it would provide strong evidence for asteroid-mass PBHs as dark matter.

Context: Dark matter, an invisible and mysterious substance, makes up the vast majority of the universe's mass but has never been directly observed. Scientists have explored various candidates for dark matter, from exotic particles to non-luminous celestial bodies. However, direct detection experiments and astronomical observations have largely ruled out many of these possibilities, leaving a significant gap in our understanding of the cosmos. This video explores a compelling hypothesis: that dark matter could be composed of primordial black holes (PBHs) formed in the very early universe, and proposes a novel method to detect them using our own Solar System.