Thinning Upper Atmosphere

ISS008-E-8951

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 thermosphere. According to a study by the Naval Research Laboratory, the density of the thermosphere has decreased about 10 percent over the last 35 years. These findings are important both for space science and for Earth science. Spacecraft in orbit, such as the International Space Station, experience less drag and need fewer boosts to maintain their orbit.

Massive Sandstorm in Qatar ISS008-E-16355

This striking photograph shows a massive sandstorm sweeping over the Persian Gulf state of Qatar as it races southward toward southeastern Saudi Arabia and

the United Arab Emirates on February 15, 2004. A major upper level low pressure over southwestern Asia led to a series of storms sweeping through the

area.

We Classify Dynamic Events As:• An unexpected and/or short-term event

ISS005-E-9691, Digital Camera, 800 mm lens, August 13, 2002

ISS005-E-17833, Digital Camera, 800 mm lens, October 19, 2002

Lake Poopo Site

• Western Bolivia• Andean Altiplano• Over 12,000 ft• Cold, arid to semi-arid

climate• Changes in water color

and levels

Lake Poopo Site