A comet called C/2013 A1 or Siding Spring will pass within about 139,500 kms of Mars Sunday, NASA said in a statement.
China today successfully sent an experimental orbiter into space to conduct scientific and technological experiments.
NASA’s prolific Mars Reconnaissance Orbiter has completed five years of circling the Red Planet.
China will launch its sixth orbiter into space in the "coming days" as part of its plans to set up indigenous satellite-navigation and-positioning network, a top official said.
China has drawn up a technical plan to send an orbiter to Mars in 2013 for exploration of the planet.
Scientists are impressed with the flood of data beamed back by NASA`s most advanced Mars orbiter.
Day in Pics: 29th January
Showbiz World - January 29, 2015
Beating Retreat ceremony