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Katalyst’s 770-pound LINK spacecraft will ride a Pegasus XL off an L-1011 to chase the Swift Observatory and boost its 249-mile orbit on June 17

NASA will attempt something it has never done before on June 17: launch a small robotic spacecraft to chase down an aging ...

Wildfires are making the US smoggy again, reversing progress on cleaner air, study finds

For more than a decade, the United States dramatically reduced its national smog levels, but since 2015 smoke from ...