At least this theory suggests it might be.
In short, the Sun is collecting dark matter on its journey through space, increasing its apparent mass, thus slowly shrinking Earth's orbit. Apparently, this should cause the semi-major axis of Earth's orbit to increase, which we can measure, and is only out by a factor of 2 or so from the observed.
Rohde & Schwarz SWP.339.0010.02
6 days ago