Crashed comets are assumed to be the origin of sunspots and all other pointlike energetic phenomena in stars planets and moons like volcanos at Jupiters moon IO.
However the gravity and light dimming effect is supposed to be multiplied if two "starspots" are aligned with the line of sight, which I call: pencil shaped lighthouse effect. also found on earth an Saturn rings.
As a consequence, alien magastructure star or Tabby's star (KIC 8462852) could be
interpreted by the existence of over sized starspots or crashed comet remnants.
For the original paper: see: https://arxiv.org/pdf/1608.01316v1.pdf
called: KIC 8462852 FADED THROUGHOUT THE KEPLER MISSION
by Benjamin T. Montet1,2 and Joshua D. Simon
and for the possible Q-FFF model solution see: https://www.flickr.com/photos/93308747@N05/albums/72157633348892116
Are Sunspots made of gravitating Dark Matter Black Holes?
Birkeland Currents, Sunspots, Comets and Ball lightning originated by new paradigm
Dark Matter Black Holes.
Evidence for Dark Matter Black Hole Based Plasma, Dust and Ice Production Inside Comets Like 67P,C-G. and the Growing Earth.
Other examples closer to home.
Temporary spokes at the rings of Saturn, by dual black hole pencil gravity effect.
See also: anomalous gravity effects on earth and moon.