The Universe is everything we can touch, feel, sense, measure or detect. It includes living things, planets, stars, galaxies, dust clouds, light, and even time. ... The Universe contains billions of galaxies, each containing millions or even trillio...
Galaxies can sometimes crash together in a spectacular pile-up, giving birth to thousands of hot stars. The collision causes a tug of war as each galaxy pulls at the other. NGC 2207 and IC 2163 form a pair of colliding galaxies that will merge in a billion years.
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