冰雪星辰

Like distant galaxies amid clouds of interstellar dust, chunks of sea ice drift through graceful swirls of grease ice in the frigid waters of Foxe Basin near Baffin Island in the Canadian Arctic. Sea ice often begins as grease ice, a soupy slick of tiny ice crystals on the ocean’s surface. As the temperature drops, grease ice thickens and coalesces into slabs of more solid ice.

This image was acquired 20 years ago today by the Landsat 7 satellite. To learn more about the NASA/USGS Landsat Program, visit https://landsat.gsfc.nasa.gov.

Image Credit: USGS/NASA/Landsat 7

在加拿大北极巴芬岛附近的福克斯盆地寒冷的海水中，大块的海冰像星际尘埃云中的遥远星系一样，漂浮在优雅的油脂状冰漩涡中。海冰通常以油脂状冰开始，油脂状冰是海洋表面的一种由微小冰晶组成的粘性滑面。随着温度下降，油脂状冰变厚并聚结成更坚固的冰块。

这幅图像是20年前的今天由陆地资源卫星7号卫星拍摄的。如欲了解有关NASA/USG陆地资源卫星计划的更多信息，请访问https://landsat.gsfc.nasa.gov.

影像来源：USGS/NASA/Landsat 7