Planetologists hope, that Mars won’t suffer in October, 2014 during comet flight by it. In spite of the fact that Mars is far from Earth, is also as well as our planet periodically is under the threat of rapprochement with comets and asteroids. So, by estimates of scientists, in October 2014 the comet of C/2013 A1 will approach with the Red Planet. This comet was found for the first time on January 3, 2013 by the Australian astronomer Robert Maknotom in observatory the Siding Spring with the help 0.5м Schmidt’s mirror and lens telescope. A comet Maknota and her trajectory of flight watched about two months in the course of what it was calculated that there is a small probability of collision of a comet with Mars on October 19, 2014. When passing by a comet of an orbit of Mars its relative speed will make 56 km/s. Diameter of a shock crater in case of collision will be approximately ten times more than a comet kernel. Diameter of a kernel is estimated in the range from 8 to 50 kilometers. By estimates of some astronomers, it is supposed, that the comet Maknota can pass at distance of 41300 kilometers from the central point of Mars. In April, 2013 of NASA published new data according to which collision of a comet of C/2013 A1 with Mars is improbable. By new estimates, the probability of this event makes 1:120000 instead of former 1:8000. The comet will pass at distance in 110 000 km from Mars at 18:51 GMT on October 19, 2014. The last data obtained by workers from Laboratory of Jet Movement, say that probability of collision of a comet C/2013 A1 with Mars decreased with 1 to 8 000 to 1 to 120 000.