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When they talk about astronomy, this means that a large part of their focus is on protecting the remote sites where large telescopes and observatories are set up around the world from electromagnetic interference.

He drips contempt for people who are skeptical that an electromagnetic pulse will soon wipe out New York City, or disbelieve Barack Obama is about to be tried for treason.

Although humans can't see them, radio waves are a form of light in the sense that they are part of the electromagnetic spectrum, which also includes X-rays and gamma rays.

Durham was trained as an electronic intelligence/electromagnetic warfare analyst assigned to 1st Radio Battalion, I Marine Expeditionary Force Information Group, officials said.

Webb’s four astronomical instruments observe in the near- to mid-infrared part of the electromagnetic spectrum, allowing it to see much farther in space and further back in time than Hubble.