Thinning Upper Atmosphere

Credit: Credit: NASA/JSC, Posted on: Monday, 23 February 2004, 06:00 CST Download full size image

From a vantage point about 360 km (225 miles) over the Earth, Space Station crewmembers photographed the crescent moon through the upper layers of Earth’s atmosphere. At the bottom of the image, a closed deck of clouds is probably at about 6 km (3 miles). The shades of blue grading to black are caused by the scatter of light as it strikes gas molecules of the very low density upper atmosphere. Models predict that emissions of carbon dioxide are causing the upper atmosphere to cool and contract, and therefore reduce the density of gases in the layer spanning from 90 to 649 km (60 to 400 miles) above the surface—known as the thermosphere.

More Images

Mars
Kasei Valles And Sacra Fossae, In Perspective.Mars Express flew over the boundary between Kasei Valles and Sacra Fossae and imaged the region, acq...

---

Universe
Shadows Side by Side.A pair of moon shadows and a series of spokes adorn this ring image taken about a month after Saturn...

---