How many robots were sent to mars?

Answer 1

There are two rovers currently active on the planet Mars. Spirit which which is exploring the Gusev Crater and Opportunity which is exploring the Meridiani Planum. Both rovers have far outlasted their intended lifespan of 90 sols (Martian days) due to wind sweeping dust off of their solar panels.

Answer 2

1 robot

There are seven machines (rovers) on Mars, of which three are active. Wikipedia told me so:

Seven rovers have been sent to Mars:

• Mars 2, Prop-M rover, 1971, landing failed.
• Mars 3, Prop-M rover, 1971, communication failure after landing. The Mars 2 and 3 spacecraft from the USSR, had identical 4.5 kg Prop-M rovers. They were to move on skis while connected to the landers with cables. The Mars 2 rover crashed into the Martian surface.[2] The Mars 3lander stopped communicating about 20 seconds after landing.[2] Mars 2 and Mars 3 both had companion orbiters which were successful.

• Sojourner rover, Mars Pathfinder, landed successfully on July 4, 1997. Communications were lost on September 27, 1997.

• Beagle 2, Planetary Undersurface Tool, lost with Beagle 2 on deployment from Mars Express.[3] A compressed spring mechanism was designed to enable to movement across the surface at a rate of 1 cm per 5 seconds[3] and to burrow into the ground and collect a subsurface sample in a cavity in its tip.

• Spirit (MER-A), Mars Exploration Rover, landed successfully on January 4, 2004. Nearly 6 years after the original mission limit, Spirit had covered a total distance of 7.73 km (4.80 mi) but its wheels became trapped in sand.[4] Around January 26, 2010, NASA conceded defeat in its efforts to free the rover and stated that it would now function as a stationary science platform.[5] The last communication received from the rover was on March 22, 2010 and NASA ceased attempts to re-establish communication on May 25, 2011.[6]

• Opportunity (MER-B), Mars Exploration Rover, landed successfully on January 25, 2004. Opportunity was still operating as of 2012, having surpassed the previous record for longevity of a surface mission to Mars on May 20, 2010.[7][8]

• Curiosity, Mars Science Laboratory, by NASA. It was launched November 26, 2011 at 10:02 EST[9][10] and landed in the Aeolis Palus plain near Aeolis Mons (formerly "Mount Sharp")[11][12][13][14] in Gale Crater on August 6, 2012, 05:31 UTC.[15][16][17]

Answer 3

5 robots explored mars and 1 of them failed when it was actually on mars because some toxic dust got inside it and messed up its system.

Answer 4

Three

Answer 5

None.

Answer 6

1