21. The mass of a star can be directly determined only from its gravitational attraction . 22. The relative masses isn't what's important, but rather the gravitational attraction of the bodies. 23. However the bulges can be slightly misaligned with respect to the direction of gravitational attraction . 24. In some of the variations the ships fight near a planet which has gravitational attraction . 25. Isaac Newton later gave a theoretical explanation based on laws of gravitational attraction and dynamics. 26. A "'satellite galaxy "'is a galaxy that orbits a larger galaxy due to gravitational attraction . 27. So, they defined two independent circular orbits, not taking gravitational attraction into account at all. 28. The gravitational attraction of Earth's mass prevents other non-thermal loss processes from appreciably depleting the atmosphere. 29. When observed visually, clusters appear to be collections of galaxies held together by mutual gravitational attraction . 30. Another person's telescope magnified the Beehive Cluster, a group of stars held together by gravitational attraction .
