Space & Science News

NASA’s Cassini spacecraft has been orbiting the Saturnian system for over 3.5 years now. During that time, many exciting discoveries have been made. One of those is the moon Enceladus: it’s south polar region is ejecting frozen water vapor into space. So Cassini is being directed to fly through the edges of the geysers to determine what they’re made up of. The geysers were discovered by Cassini in 2005. Of additional interest, the material is bolstering Saturn’s E-ring.

*****

NASA has invited other nations to place instrumentation in a Lunar Network. To kick off the ILN, NASA would lob on one launcher two small landing packages, one each to the poles of the Moon. The target launch date is 2013-2014. A second pair of U.S. nodes would fly in 2016-2017. Ideally, by year’s end, what nations are joining in on the network, what core instruments are to be flown, and a landing site working group will be agreed to.

*****

It was reported last week that our nearest stellar neighbor, Alpha Centauri, might contain Earth-like planets. From the article:

“Several factors mark the system, particularly Alpha Centauri B as friendly to planet formation, [study co-author Gregory] Laughlin said. The metallicity of Alpha Centauri B (or how much of its matter is made up of elements heavier than hydrogen and helium) is higher than our Sun’s, so there would be plenty of heavier-mass material for planets to form from, he said. [...] The Doppler detection method, which has revealed the majority of the 228 known extrasolar planets, measures shifts in the light from a star to detect the tiny wobble induced by the gravitational tug of an orbiting planet.

Because Alpha Centauri B is so bright and nearby, detecting a small terrestrial planet’s miniscule wobble would be that much easier. Also, its position high in the sky of the Southern Hemisphere means it is observable for most of the year, just as the Big Dipper is observable for most of the year in the Northern Hemisphere.”