Atlas V Launch Vehicle, Solid Rocket Motors .jpg
Used to increase engine thrust; 4 total on NASA's Mars 2020 Atlas V Launch Vehicle.
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Solid Rocket Motors

Four solid rocket boosters strapped onto the common core booster add to the thrust produced by the first stage. Each of these boosters is 64 feet (19.5 meters) long and 61 inches (155 centimeters) in diameter, and delivers about 306,000 pounds (1.36 million newtons) of thrust.

Atlas V-541 Examples from NASA’s Mars Science Laboratory mission


The major elements of the Atlas V-541 rocket
that will be used for the Mars 2020 mission are: