Why Are Planetary Orbits Elliptical?

The video explores the nature of planetary orbits, explaining that while traditionally depicted as circular, they are actually elliptical due to eccentricity. It delves into the historical understanding of orbits, highlighting Kepler's laws, and discusses the factors affecting orbital shapes. The video also examines the implications of elliptical orbits on planetary stability and potential collisions, emphasizing the survival of planets with nearly circular orbits.

What is the shape of the orbits that planets generally follow?

What does the term 'eccentricity' refer to in the context of planetary orbits?

Why is it that most planetary orbits are not perfectly circular?

What historical beliefs about planetary motion were challenged by Kepler?

How do changes in mass, velocity, or distance affect a planet's orbit?

In what ways do highly elliptical orbits pose risks compared to circular orbits?

What are the potential consequences of a collision between planetary bodies?