APOD090706 水星上未知的黝黑物质
http://apod.nasa.gov/apod/ap090706.html2009 July 6
Unknown Dark Material on Mercury
http://apod.nasa.gov/apod/image/0907/darkmercury_messenger.jpg
Credit: MESSENGER, NASA, JHU APL, CIW
Explanation:
What is that strange material on Mercury? When flying by Mercury last October, the robotic MESSENGER spacecraft imaged much of the solar system's innermost planet in unprecedented detail. As common in science, new data bring new mysteries. Pictured above on the lower right, a large crater -- about 100 kilometers across -- has unusual dark material of unknown composition near its center. The material's darkness does not appear to be caused by shadows, as the Sun was near zenith when the image was taken. One origin hypothesis is that the dark material was uncovered from beneath Mercury's surface during the impact that created the surrounding crater. If so, the composition of the dark mound might be similar to the composition of some mysterious dark rings also recently discovered on Mercury. Alternatively, the dark material could be related to an unusual composition of the impacting rock. MESSENGER will buzz past Mercury again later this year before entering orbit in 2011. 这个APOD大图也大得有限，1018X1024，好歹大一点
http://apod.nasa.gov/apod/image/0907/darkmercury_messenger_big.jpg 北京天文台的翻译估计休长假去了，所以这些翻译只能选用成大的。
http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap090706.html
水星上的黝黑物質
影像提供: MESSENGER, NASA, JHU APL, CIW
說明: 水星上的黝黑物質是什麼？當信使號太空船(MESSENGER spacecraft)去年十月飛越水星時，對於這個太陽系最內側的行星拍下許多細緻影像。如同其他科學，新資料帶來新認知。影像的右下，直徑約100公里的隕石坑，在中心處有個異常的黝黑物質。當時太陽正在天頂，因此這黑色並不是陽光照射所造成的陰影。一個起源假說是當撞擊發生時，此處並沒有被水星表面的物質所覆蓋保護著。如果真是如此，這可能跟最近在水星上所發現神秘的黑色環狀物質成因相似。或許，這黝黑物質是和撞擊的岩石材質有關。信使號太空船預定在今年九月再次通過水星，在2011年則開始公轉水星。
这个翻译差强人意，总体意思是：黝黑的物质（我特意避免使用暗物质这个称呼，因为它有专用的含义）是（铁质）陨石本身，只是这样的解释貌似还有其他的问题呢。 又来拍我家了，是吧，收版权费！ 昏，没分加还要收钱？ ::070821_13.jpg::水星人老实交代，那是什么
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