Distant galaxies are faint and hard to observe. explain why we study them

wavelength divides in half and speed stays the same.

the rearrangement of particles in a physical change. hope this

pretty sure it's false

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.