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The hidden physics complicating interstellar lightsails

If we're to reach another star, chemical propulsion will not get us there in any reasonable time frame. We're going to need a different propulsion technology, and one of the most promising seems to be a solar sail. These giant reflective surfaces form the basis of many

Mullin on FISA lapse: Threat level 'highest it’s ever been'

Homeland Security Secretary Markwayne Mullin on Sunday said the department is facing a threat level that’s the "highest it’s ever been” with the lapse of spy powers authorized by Section 702 of the Foreign Intelligence Surveillance Act (FISA). The powers expired on Friday after