A spectacular view of Enceladus passing by Titan. The Cassini spacecraft is far enough away that we see their relative sizes. Enceladus has a diameter of 520 km, while Titan is the biggest satellite in the solar system with a diameter of 5150 km. What these two moons have in common is vulcanism.
Enceladus has a plume of gas venting from the hot spot on its South Pole, while Titan produces methane gas from an energy source in its interior. There is also evidence that Mars produces methane. This lends credence to Thomas Gold's theory that Earth continually produces hydrocarbons due to an internal heat source. Is our planet still producing oil?
From Titan to "TITANIC: the Artifact Exhibition" opened this month in San Francisco. I took this photo from the deck of the Queen Mary. February 23, 2006 was the first rendezvous with the new QUEEN MARY 2. QM2 is listed at 150,000 gross tons. The new ship has every conceivable luxury, including the first planetarium at sea.
TOMORROW: How big Queen Mary 2 is, plus another Saturn moon.