This is of course a hoax photograph.
I created it by taking the picture below with a digital camera.
Then I took a 3D computer model of
a flying saucer and rendered it using the same blue screen technology that's
used in Hollywood movies. The background image photograph of
the RCU Building replaces all blue areas while the flying saucer which is
not blue gets replaced over that area.
Then I simply composited the two
images together to produce a realistic looking image of a flying saucer hovering
over the RCU Building at San Jose's Rosicrucian Park..
Here's yet another example using
the same background picture this time with the Babylon 5 Shadow vessel.