Telescopes and Equipment How does one determine magnification? I have an Edmund Scientific Astroscan, 4-1/8-inch aperture, F/4.2 reflecting telescope, used with a 2.5x Barlow lens and a 28mm Plossl eyepiece.
Telescopes and Equipment I am struggling to find a system for telescopic observations of the planets and their major moons worthy of photographing. One wrinkle: I am in a wheelchair and almost blind.
Science Plenty of really hot things exist in the universe. But do we know of fire anywhere besides on our planet?
Exoplanets, Planets Most of the photographs I see of the aurora borealis are green. Is this due to the film used?
