... Comet Hale-Bopp is spinning. ... As Comet Hale-Bopp spins, parts of the comet's surface shoot away in jets. ... Arecibo: The Largest Telescope . ... The Arecibo radio telescope is currently the largest single-dish telescope in the world. ... The Arecibo telescope has been used for many astronomical research projects, including . ... Europa's Ice Rafts . ... The surface of Jupiter's moon Europa has shifted. ... Oceans Under Jupiter's Europa? ... What's that point of light above the World Trade Center...