Astronomers, in mapping out a galaxy’s rotation curve, have noticed that the curve indicates that the galaxy shows more weight (matter) than is visible. This solid matter keeps the galaxy together through gravity. But the matter is invisible.
Also called dark matter, it is a sign that God is comfortable with things that are invisible (angels, demons, apparitions of the Blessed Mother). Prepare yourself to enter such a world until the last day. Doesn’t sound at all dull, right?