Mars robotic rovers and orbiters are set to have a front row seat for a comet that will be flying past the Red Planet so close it will be less than one-tenth the distance of any known comet flyby of Earth.

NASA scientists are just trying to make sure it’s not dangerously close.

What astronomers are describing as a “once-in-a-lifetime” comet flyby is expected to zoom within about 87,000 miles of Mars on Sunday, Oct. 19.

While that distance may seem large, it is less than half the distance between Earth and our moon.

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