Yes, light is energy. Galaxies do not explode; they aren't solid bodies. They're made up of stars, gas, dust, and dark matter, and only some of the stars in galaxies can explode. We see light from these exploding stars all the time, from gamma ray bursts and supernovae, and that's energy from these very distant galaxies reaching us. It can take billions of years for these photons (light particles) to reach us.
Way to confuse me.
Light is energy. It can change the speed of objects in space. But galaxies don't explode or scatter seeds.
yeah light is energy.
For your second part of your question, i dont exactly understand.
Yes, light is energy. But its power to change the motion of anything is very weak.
Galaxies do not explode, but stars do. Still, the pushing power of the light from a galaxy, including the light from exploding stars in the galaxy, is very very small compared to the power of the explosions themselves and gravity. Anything from another galaxy, no matter how hard it was pushed, would take billions of years to reach the Earth.