新闻-土星外围在另一个环！

画王845

中新网10月8日电 据香港《文汇报》8日报道，美国宇航局在土星环外围再发现一个“超级巨型”的土星环，这个超巨土星环之大，足以容纳10亿个地球。

　　宇航局喷射推进实验室科学家利用红外线观星镜，发现这个由细小的冰粒同尘埃组成的土星环，其轨迹相对主环倾斜27度。它的温度接近摄氏负157度，结构非常松散，难以反射光线，所以至今才被发现。这个超巨土星环大部分物质在距离土星595万公里外展开，伸延至1190万公里外。

　　参与研究的科学家汉米顿表示：“天文学家长久以来都怀疑土星外的卫星菲碧与亚佩特斯的黑暗物质有关系，今次新发现的土星环为这个关系提供了可靠的证据。”
转载自中国新闻网

NASA的消息
On 6 October 2009, the discovery was announced of a tenuous disk of material in the plane of and just interior to the orbit of Phoebe, which can be loosely described as another ring. This ring is tilted 27 degrees from Saturn's equatorial plane (and the other rings). It extends from 128 to 207 times the radius of Saturn; Phoebe orbits the planet at an average distance of 215 Saturn radii. The ring is about 20 times as thick as the diameter of the planet. Since the ring's particles are presumed to have originated from micrometeoroid impacts on Phoebe, they should share its retrograde revolution,which is opposite to the orbital motion of the next inner moon, Iapetus. Inwardly migrating ring material would thus impact the latter's leading hemisphere, possibly causing the two-tone coloration of that moon. Although very large, the ring is virtually invisible—it was discovered using NASA's infra-red Spitzer Space Telescope. The existence of the ring was proposed in the 1970s by Joseph Burns of Cornell University.

tsw318

   好。。

大漠之鹰

走过路过绝不错过！！