It was all being done with trick photography!
"Eight Keys to Eden"
Mark Irvin Clifton
It is told of Schwann that when Daguerre's discoveries in photography were announced, such was his interest in the new invention that he made a trip to Paris especially to learn the details of the method.
"Makers of Modern Medicine"
James J. Walsh
If such a sensitive plate is placed at the focus of a reflecting telescope, the combination becomes a camera available for astronomical photography, and at the present time the tendency is strong in nearly every branch of astronomical research to substitute the sensitive plate in place of the observer at a telescope.
"A Text-Book of Astronomy"
George C. Comstock