Alien invasion?
If it wasn't visible to you, it'll be the light from the sun in the camera lens going in non-obvious directions. Lenses have a lot of layers, and although the light mostly goes in the direction you want it to (think your classic picture of the light in Galileo's telescope), at each junction a little might reflect off rather than going straight through, and that results in effects like the one you're seeing.
It's called lens flare.
https://en.wikipedia.org/wiki/Lens_flare
The classic image in sci-fi films of a sun, star, or other bright light sun appearing not as a point, but as a very wide horizontal thing, is actually an artefact of the lenses used for widescreen cinematography - and since people are so used to it, these days it's often faked if different lenses are being used