What is the role of physics in Astronomy ?

Explanation

**Step-by-Step Solution:**

1. **Definition of Astronomy**:
- Astronomy is the scientific study of celestial objects, space, and the universe as a whole. It involves observing planets, stars, galaxies, and other phenomena beyond Earth's atmosphere.

2. **Use of Physics in Astronomy**:
- Physics provides the fundamental principles that govern the behavior of matter and energy in the universe. This includes understanding forces, motion, energy, and waves, which are crucial for interpreting astronomical observations.

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