The video explores the concept of orbiting, explaining that astronauts experience gravity similarly to those on Earth but are in constant free-fall. Newton's thought experiment with a cannonball illustrates how objects can orbit. The video then discusses the sun's fusion process and the hypothetical impact of adding water to it. Finally, it touches on the universe's expansion, highlighting the vastness of space and our relative closeness on Earth.

What is the significance of the relationship E=mc² in the context of fusion reactions?

Discuss the potential consequences of attempting to extinguish the sun.

How does the expansion of the universe affect the travel of a bullet fired in space?