红色星球上的蓝色沙丘

A sea of dark dunes, sculpted by the wind into long lines, surrounds Mars’ northern polar cap and covers an area as big as Texas. In this false-color image, areas with cooler temperatures are recorded in bluer tints, while warmer features are depicted in yellows and oranges. Thus, the dark, sun-warmed dunes glow with a golden color. This image covers an area 19 miles (30 kilometers) wide.

This scene combines images taken during the period from December 2002 to November 2004 by the Thermal Emission Imaging System instrument on the Mars Odyssey orbiter. It is part of a special set of images marking the 20th anniversary of Odyssey, the longest-working Mars spacecraft in history. The pictured location on Mars is 80.3 degrees north latitude, 172.1 degrees east longitude.

Image Credit: NASA/JPL-Caltech/ASU

在火星的北极帽周围，被风塑造成长长的线条的黑色沙丘海洋，覆盖了像德克萨斯州那么大的面积。在这张伪彩色图像中，温度较低的区域用蓝色记录，而温度较高的区域则用黄色和橙色记录。因此，黑暗的、被阳光温暖的沙丘闪耀着金色。这张照片覆盖了19英里(30公里)宽的区域。

这张照片结合了奥德赛火星轨道飞行器上的热发射成像系统仪器在2002年12月至2004年11月期间拍摄的图像。这是一组纪念奥德赛号火星探测器20周年的特别照片中的一张。奥德赛号是历史上工作时间最长的火星探测器。照片上火星的位置是北纬80.3度，东经172.1度。

影像来源：NASA/JPL-Caltech/ASU