25. Which tools do astronomers use to determine the effects of collisions between galaxies?

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computer simulations
space telescopes
print encyclopedia entries
solar system models

Astronomers use computer simulations and space telescopes to determine the effects of collisions between galaxies. These tools allow them to study and analyze the motion, structure, and dynamics of galaxies during collision events. Print encyclopedia entries and solar system models may provide general information on galaxies and collisions but are not specifically used for determining the effects of collisions.