This photograph - showing a gold object of some kind above Baildon Moor - was sent in to the Telegraph & Argus today.
To some, it might appear it is a frisbee or some such object, but James Hobbs, who took the picture, is convinced it was flying saucer.
Mr Hobbs, who works in Shipley and whose office overlooks the moor, said he heard a "loud vibrating noise" while walking there at about 7am today.
Although the picture could be a frisbee or He said: "It was getting louder and also seemed to be getting closer, I turned around and saw a large gold object in the sky which was some kind of spaceship? I was able to get my mobile phone out of my pocket and take a picture."
In his e-mail to the T&A, Mr Hobbs, who lives in Methley, near Castleford, added: "I am still in a state of shock by the whole experience."
Did you see anything in the sky above Baildon Moor this morning? If so, contact firstname.lastname@example.org