... Observing . ... Supernova showered Earth with radioactive debris . ... Observing springtime deep-sky objects with a large telescope . ... Gas from Saturn's largest moon . Titan's surface organics surpass oil reserves on Earth. ... Saturn's orange moon Titan has hundreds of times more liquid hydrocarbons than all the known oil and natural gas reserves on Earth, according to new data from NASA's Cassini spacecraft. ... Only registered members of Astronomy.com are allowed to comment on this article. ...