A composite of long exposure images showing SpaceX’s Starlink satellite constellation passing over London earlier this year. Photograph: Stephen Chung/Alamy Live News

Are Elon Musk’s ‘megaconstellations’ a blight on the night sky?

A composite of long exposure images showing SpaceX’s Starlink satellite constellation passing over London earlier this year. Photograph: Stephen Chung/Alamy Live News By Stuart Clark, Published by the Guardian, 12 September 2020 Miniature satellites open up a world of technological possibility. But experts say they degrade the astronomical landscape The

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EPA will not regulate perchlorate

Perchlorate, a chemical compound used in rocket fuels (such as the Space Shuttle’s solid propellant seen here during the program’s final launch in 2011) and other materials, may be a more hazardous pollutant than previously thought. Credit: M.E. Newman, Johns Hopkins Medicine, using NASA and public domain images. By Julia

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The launch plume from a test missile, photographed on 10 October 2013 by astronaut Luca Parmitano, diffuses into the middle and upper atmosphere during the first several minutes after launch. As the number of rocket launches increases in the future, rocket engine emissions will increase proportionally. Credit: © European Space Agency/NASA

The Coming Surge of Rocket Emissions

The launch plume from a test missile, photographed on 10 October 2013 by astronaut Luca Parmitano, diffuses into the middle and upper atmosphere during the first several minutes after launch. As the number of rocket launches increases in the future, rocket engine emissions will increase proportionally. Credit: © European Space

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