Why are asteroids mostly irregular in shape? Because their gravity pulls everything towards the center of the asteroid Because their gravity deforms the rocks present on their surface Because they have more mass than planets and therefore more gravity Because they have less mass than planets and therefore less gravity

Answer : Because they have less mass than planets and therefore less gravity

There are two main reason asteroids are formation of smaller rocks in space bound together and as they increase in mass and size, they also produce gravitational force but a lot less than planets, with such little gravity the same principle on planets where the heavier materials are closer to the core does not apply to asteroids, as such the surface is not compacted. Also the surface experience collisions with several other asteroids which produces the crater in them.