Aboard the M/S Midnatsol, a cruise ship plying the fjord-fringed coast of Norway, British astronomer John Mason said the lights danced around in "fantastic structure" Tuesday evening.
Solar storm expected to fire up northern lights →
"We had green arcs with rays going up in the sky. And because we were underneath them, they were making all kinds of shapes in the sky. One looked like a heart," he said.