“gravitationally”简单造句，gravitationally造句子

Galaxies can also have modest local motions as they mill around and gravitationally pull on one another— as the Milky Way and Andromeda are doing.

At the observed speeds, the outer galaxies should be flung out into space, since the clusters don't appear to have enough mass to keep the galaxies at their edges gravitationally bound.

A large cloud of gas and dust begins to congeal gravitationally, starts rotating, and eventually flattens into an object called a protostellar disk.