Video2

=**Video 2: The Elegant Universe Einstein's - Relativity **=

**Before watching **
====**What is gravity?** The natural force of attraction between any two massive bodies, which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. ====

I don't know.
===="General relativity or the general theory of relativity describes gravity as a geometric property of [|space] and [|time], or [|spacetime] . In particular, the [|curvature] of spacetime is directly related to the [|four-momentum] ( [|mass-energy] and linear [|momentum] ) of whatever [|matter] and [|radiation] are present. The relation is specified by the [|Einstein field equations] , a system of [|partial differential equations] ." [] ====

Attration
Curvature.

1. Click on the following link to watch the video:
====[] ==== ==== 2. Which of the words in the question above did you find in the video? List them: Gravitation, Theory, Spacetime and Curvature. ====

3. What was the embarrassing secret Newton was holding about gravity? He had no idea how gravity actually works.
====4. The narrator presents some examples in the video. What happens in the first one? What happens to the sun and planets? Explain ====