Siding Spring came within 87,000 miles of Mars ; that 's close for a comet flyby . Comment: The Mars Reconnaissance Orbiter was the first of the spacecraft to report it was unharmed as the comet passed . The first of three NASA orbiters reported to be in good health .
Siding Spring came within 87,000 miles of Mars ; that 's close for a comet flyby . Comment: The first of three NASA orbiters reported to be in good health .