What is Dark Matter

The video explains the concept of dark matter, which is more prevalent than visible matter but cannot be directly observed. It discusses how gravity holds galaxies together despite the insufficient gravitational force from visible stars, suggesting the presence of dark matter. The video also covers the Doppler effect, which helps measure the speed of stars and the rotation of galaxies, using observable phenomena to infer the existence of dark matter.

What is dark matter and how is it different from visible matter?

How do scientists infer the existence of dark matter if it cannot be seen?

Explain the analogy of a galaxy being like a giant merry-go-round.

What role does gravity play in the structure of galaxies?

Describe the Doppler effect and its significance in measuring the rotation of galaxies.