That’s a space station!
Astrophotographer Thierry Legault travels to Oman to get to the one spot on earth where he can snap a shot of the ISS transiting the sun during a partial solar eclipse. The ISS transit takes about 1 second, which doesn’t leave a lot of room for error for hitting the shutter release. Granted he’s had several other funky solar transit shots featured on Plait’s blog, but this one takes the cake IMO.