PLEASE HELP IM TIMED WILL MARK BRAINLIEST 13 POINTS Which statement best explains how galaxies are held together?

A. Thermal energy generated by stars holds galaxies together
B. Magnetic forces among the components of galaxies holds galaxies together
C. Electrical energy generated by planets holds galaxies together
D. Gravitational forces among stars and other components of galaxies holds galaxies together

What are the north and south poles of a solenoid change with?

Apropagating wave in space with electric and magnetic components. these components oscillate at right angles to each other. it may travel in a vacuum. determine the term.

Aswimmer is determined to cross a river that flows due south with a strong current. initially, the swimmer is on the west bank desiring to reach a camp directly across the river on the opposite bank. in which direction shoud the swimmer head? a. the swimmer should swim southeast. b. the swimmer should swim south. c. the swimmer shuold swim northeast. d. the swimmer should swim due north. e. the swimmer should swim due east.