Dear EarthTalk: How is air quality across the U.S. these days? -- Paul Jackson, Washington Answer: Air quality is defined as the degree to which the air of a set place is pollutant-free. In the ...

The Space Force recently launched a survey of the commercial marketplace for companies that can track and characterize activities in low Earth orbit. As more commercial and government satellites ...

A Chinese rocket broke apart in low-Earth orbit after delivering 18 satellites to space. Experts are still assessing the risks of the event.