ATLAS Discovered Interstellar Comet Near Earth
It will pass closest to Earth at 167 million miles.
The comet formed outside our galaxy and was tracked since its summer discovery.
XMM-Newton and Japan's X-Ray mission detected X-rays 248,000 miles away.
The comet poses no threat and remains distant.
Skywatchers can view it before sunrise with an 8-inch telescope.
Kohler warned the comet will not return to our solar system.
Previous interstellar comets produced no X-rays, requiring more observations.