Gravity: Geometry shaping the Universe

https://www.youtube.com/watch?v=KjkZtzjDWc8&t=3457s

Brief description:

If objects are truly massive, like planets and stars, they can exert huge gravity on astronomical bodies. That's the same force that makes us feel weight on Earth. Rather than forces though, modern scientists understand gravity as the geometry of space (and time). That is the realm of general relativity. Massive objects curve the fabric of space, like pushing an elastic band, and get deflected back by space itself, in a two-way intertwined fashion. What looks the curved orbit of Earth around the Sun is nothing but a straight line on the curved fabric of space. This is also the right time to discuss solar systems around far-away stars, the evolution of stars and history of the Universe.