Sydney, Australia.- The night skies of the southern hemisphere will receive a strange visitor over the next two weeks. A brilliant greenish blue comet, believed to have originated in an icy region on the edge of the solar system, will oscillate over New Zealand, Australia and South Africa. The comet — known as C/2025 R3 PANSTARRS — was discovered in 2025 and has been passing slowly by the Earth. Last month was visible in the northern hemisphere …