"Less gravity" refers to a situation where the force that pulls objects downward is weaker than normal. This can make things feel lighter and can affect how objects move or stay in place. Full definition
Recent observations have revealed that it is spherical, unlike the irregular shapes of smaller asteroids with less gravity. (sciencedaily.com)
«Because ice is lower density than water, you get less gravity when you have a big chunk of ice there than when you have water,» Nimmo explained. (sciencedaily.com)