Earth's Atmosphere

A new NASA mission, the first to hitch a ride on a commercial communications satellite, will examine Earth's upper atmosphere to see how the boundary between Earth and space changes over time.

A NASA sounding rocket launched early this morning and lit up the skies over the U.S. East Coast with colorful clouds, ringing in an early July Fourth celebration.

In what appears to be a historic first, a chicken sandwich was successfully carried to the edge of space today aboard a high-altitude balloon.

One of the still-unsolved mysteries about Earth's history is how the planet became breathable. Now, scientists say the culprit may have been the giant rock slabs that make up Earth's outer shell.

In an unexpected first, researchers have discovered ammonia in the troposphere, Earth's lowest atmospheric layer, a new study finds.

Atmospheric oxygen levels have declined over the past 1 million years, although not nearly enough to trigger any major problems for life on Earth, a new study finds.

Weird radio echoes that appear at dawn every day over an observatory in Peru have long baffled scientists, until now.

The oldest space dust yet found on Earth suggests that the ancient atmosphere of Earth had significantly more oxygen than previously thought, a new study finds.