本帖最后由 gohomeman1 于 2009-12-17 14:34 编辑
Gibbous Europa
Credit: Galileo Project,JPL,NASA;reprocessed by Ted Stryk
Explanation:
Although the phaseof this moon might appear familiar, the moon itself might not.In fact, thisgibbous phase showspart ofJupiter's moonEuropa.The robot spacecraftGalileo capturedthis image mosaic during itsmission orbiting Jupiter from 1995 - 2003.Visible are plains ofbright ice,cracks that run to the horizon, anddark patchesthat likely contain both ice and dirt.Raised terrain isparticularly apparent near theterminator,where it casts shadows.Europa is nearly the same size asEarth's Moon, but much smoother, showing fewhighlands orlarge impact craters.Evidence and images from theGalileo spacecraft,indicatedthat liquid oceans might exist below the icysurface.To test speculation that these seas hold life,ESA andNASA have together started preliminary development of theEuropa Jupiter System Mission, a spacecraft proposed to better study Europa.If the surface ice is thin enough, a future mission might drophydrobots to burrow into the oceansand search for life.
这是最新的http://apod.nasa.gov/apod/astropix.html
2009.3.8,不过怎么不发个与女性有关的啊,NASA真是的。
话说每天发一图好累的,真佩服论坛中元老的毅力。今天我占位了,平时还是您发吧。 |
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