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Instead of a mysterious energy which is pushing matter.
An international team of astrophysicists have developed a new theory to explain the accelerating expansion of the Universe, known as "dark energy". Instead of a mysterious energy which is pushing matter apart at an accelerating rate, the team believes it could be the natural outcome of ripples in space and time created during the earliest moments of inflation after the Big Bang. These ripples could extend beyond what we can see with our telescopes, so we can only calculate their existence.
The European Space Agency's Envisat has completed a map of global methane emissions, and not surprisingly, areas of dense population show the highest levels of this greenhouse gas. What is a surprise, however, is that there are higher emissions than anticipated over tropical areas of the planet. This could be because of burning, termites, animals, or just increased decomposition of plants. Methane gas traps 21 times more heat per molecule than carbon dioxide, so it's important to locate these sources and limit them.
During its many months orbiting Saturn, Cassini has gotten a few good looks at Hyperion, one of the planets many moons. This irregularly shaped Moon is reasonably large (266 km or 165 miles across) and chaotically tumbles in its orbit around Saturn. Cassini took these images in October 2004 and February 2005 at relatively similar distances. It will get a much better view in September, 2005, when the spacecraft is scheduled to make a flyby at an altitude of only 990 km (615 miles).
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