- Custom Writing Service: Explain how an object (such as a planetary probe) can escape from orbit
- Explain Kepler’s first two laws of planetary motion
- Describe Newton’s three laws of motion
- Define mass, volume, and density and how they differ
- Explain what determines the strength of gravitt
- Explain how an object (such as a satellite) can be put into orbit around Earth
- Explain how an object (such as a planetary probe) can escape from orbit
