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A new University of Colorado at Boulder study shows the periodic "breathing" of Earth's upper atmosphere that has long puzzled scientists is due in part to cyclic solar wind disturbances, a finding that should help engineers track satellites more accurately and improve forecasts for electronic communication disruptions.
Our universe is a mess — a colossal "
Carbon dioxide emissions from global warming are cooling and shrinking the outermost atmosphere, keeping orbiting spacecraft airborne longer but also increasing the threat that space junk poses to satellites.
NASA has extended the mission of a satellite probing the least-studied region of the Earth's atmosphere through 2010.
Greenhouse gases -- the heat-trapping chemicals linked to global warming -- continued to increase steadily in 2005, the U.S. National Oceanic and Atmospheric Administration reported on Monday.
The greenhouse gases widely blamed for raising the planet's temperature are still building up in the atmosphere.
The concept of time is self-evident. An hour consists of a certain number of minutes, a day of hours and a year of days. But we rarely think about the fundamental nature of time.
- Growing in low tufty patches.