It's a challenging task, but astronomers have made progress on one front: the study of dark matter and dark energy, two of the most mysterious substances in our cosmos. (sciencedaily.com)
Much research remains before we can understand the role of this promising but mysterious substance in alternative medicine treatments. (wellnessmama.com)
These hard - to - find objects seem to be made almost entirely of dark matter, the famously mysterious substance that holds galaxies together and doesn't interact with light. (discovermagazine.com)