What is happening to the galaxies in the universe?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Concept of Galaxies**:
- Galaxies are massive systems that consist of stars, stellar remnants, interstellar gas, dust, and dark matter. They are the building blocks of the universe.

2. **Observation of Galaxies**:
- Scientists have observed that galaxies are not stationary; they are in constant motion. This motion is primarily due to the gravitational forces acting between them.

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