水手峡谷: 火星的大峡谷
A picture of Mars is shown as a large orange globe. Across the center of the planet a long canyon is visible. Please see the explanation for more detailed information.
火星图片显示为一个巨大的橙色球体。在火星的中心可以看到一条长长的峡谷。有关更多详细信息，请参阅说明。
水手峡谷:火星的大峡谷
2020 May 24 Valles Marineris: The Grand Canyon of Mars Image Credit: NASA, USGS, Viking Project Explanation: The largest canyon in the Solar System cuts a wide swath across the face of Mars. Named Valles Marineris, the grand valley extends over 3,000 kilometers long, spans as much as 600 kilometers across, and delves as much as 8 kilometers deep. By comparison, the Earth’s Grand Canyon in Arizona, USA is 800 kilometers long, 30 kilometers across, and 1.8 kilometers deep. The origin of the Valles Marineris remains unknown, although a leading hypothesis holds that it started as a crack billions of years ago as the planet cooled. Several geologic processes have been identified in the canyon. The featured mosaic was created from over 100 images of…
大峡谷的日落与银河
2020 February 4 A Sunset Night Sky over the Grand Canyon Image Credit & Copyright: Robert Q. Fugate Explanation: Seeing mountain peaks glow red from inside the Grand Canyon was one of the most incredible sunset experiences of this amateur photographer’s life. They appeared even more incredible later, when digitally combined with an exposure of the night sky — taken by the same camera and from the same location — an hour later. The two images were taken last August from the 220 Mile Canyon campsite on the Colorado River, Colorado, USA. The peaks glow red because they were lit by an usually red sunset. Later, high above, the band of the Milky Way Galaxy angled dramatically down, filled with stars, nebula, and dark clouds…