"Deflection of light by gravity was predicted by General Relativity and observa-
tionaly confirmed in 1919. In the following decades various aspects of the gravita-
tional lens effect were explored theoretically, among them the possibility of...
The Universe is a beautiful place. Whether it’s aurorae or galaxies, planets or nebulae, the swirling shapes and striking colours of the night sky are begging to be captured in photographs. So it should come as no surprise that amateur astronomers...