A planet revolves round a massive star in a highly elliptical orbit. Is its angular momentum constant over the entire orbit ?

Explanation

To determine whether the angular momentum of a planet revolving around a massive star in a highly elliptical orbit is constant, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Angular Momentum**:
Angular momentum (L) of a particle is given by the formula:
\[
L = r \times p
...