Video2

= **Great Job 7pts ** Video 2: The Elegant Universe Einstein's - Relativity =

__What is gravity?__
====Gravity is the force that attract set of objets into each other. We usually refer to gravity as the force planets, asteroids or any other celestial bodies apply to object, attracting them into their surfaces, but this conception is valid fo every single object on universe, not only planets. ====

__Who discovered it?__
====I'm not sure, I'm just remembering Newton's apple anecdote, so I believe it was him who made the first observations about this phenomenon. ====

==== **During watching and after watching ** ==== ====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 Force, planets, orbits.

3. What was the embarrassing secret Newton was holding about gravity? He could describe__d__ the strength of gravity but he was not able to explain how __does__ this force works, so, his expanation was not completely true. ====4. The narrator presents some examples in the video. What happens in the first one? What happens to the sun and planets? Explain ==== ====In the first example**COMM**A he supposes the Sun had just dissapeared and he tried to explain what could happen ti the planets and their orbits according to Newton's ideas. So, the planets must fly out of teir orbit as soon as the Sun dissapear. ====

====5. What happens in the second one? What happens to the sun and planets? Explain ==== ====In the second case, **T**he __narrartor__ repeated the experiment, now studing the consequences acording to Einstein's idea, and it turns out the planet continues following it orbit until the action of gravity didn't reache it anymore, which took exactly the same time sun light stopped reaching the planet. ====

====6. Why was Newton’s idea of gravity incorrect for Einstein? ==== ====<span style="color: #c78bf8; font-family: Tahoma,Geneva,sans-serif; font-size: 110%;">Because it asummes that __te__ gravity was a force produced by te Sun that acted instantly on the planets, but Einstein proved it was not posible because there were no physical phenomenon that could travel faster than light, and sun light takes almost 8 minute**S** to reach Earth, so gravity could no reach the planet instantly. ====

====<span style="color: #c78bf8; font-family: Tahoma,Geneva,sans-serif; font-size: 110%;">7. What is the final definition of gravity given in the video? ==== ====<span style="color: #c78bf8; font-family: Tahoma,Geneva,sans-serif; font-size: 110%;">It is considered in the video that gravity is a curve created in the space-time fabric by heavy objects like the planets. ====

====<span style="color: #c78bf8; font-family: Tahoma,Geneva,sans-serif; font-size: 110%;">8. What’s the name Einsten gave to it? ====

====<span style="color: #c78bf8; font-family: Tahoma,Geneva,sans-serif; font-size: 110%;">9. What’s the difference between Newton’s gravity and Einstein’s gravity? ==== ====<span style="color: #c78bf8; font-family: Tahoma,Geneva,sans-serif; font-size: 110%;">Newton considered planets describe their orbits due to instantaneous force applied by th Sun, but Einstein considere they are just following curve designed on space-time fabric surface produce by Sun's presence ====