The Solar System's largest moon could be a dark matter detector, according to a new paper. All we have to do is look. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.
As far as astronomers studying the observable universe can tell, only around 5 percent of it is made up of matter. The rest, or the overwhelming majority of it, is made up of dark matter (around 27 percent) and dark energy (around 68 percent).
Dark matter is invisible matter that doesn't emit its own light and only interacts with normal matter through gravity, which we can see evidence for in galaxies and galaxy clusters . But given that there appears to be five times as much of it as regular matter, scientists are of course on the hunt for direct evidence of its exis