Which statement about galaxies is true?

A. Spiral galaxies have a galactic bulge in its center.

B. Round galaxies are new galaxies just starting to form.

C. Barred galaxies form when one galaxy orbits another.

D. Spiral galaxies come in two types, regular and elliptical.

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

Does anyone know how to solve this problem? i really need . i made an attempt but i just cant get it. a metal rod is 25.000 cm long at 25.0 degrees celsius. when heated to 102.0 degrees celsius, it is 25.054 cm long. what is the coefficient of linear expansion for this metal.

When you hold a rectangular object, how does the area of the side that is resting on your hand affect the pressure and the force that the object exerts?