Speed
[Speed of Light](https://texonom.com/speed-of-light-7f56f8bd5d7344c28bef9ec3e6ec3aa2) 


### Speed is angle between two trajectories in [Spacetime](https://texonom.com/spacetime-cb5736b026fa4c19b6b35c614b50c6b9)  
angle is usually called rapidity
![](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2F1e36fd87-8b41-4388-9f99-353381399e83%2FUntitled.png?table=block&id=d4f46b63-c196-4ba1-8047-23d201c77408&cache=v2)
진공 속의 빛의 속도보다 빠르게 정보를 전달 할 수 없다는 것
아인슈타인 논문 이름 - 움직이는 물체의 전기역학에 대하여
아인슈타인 스승 헤르만 민코프스키의 민코프스키 시공세계를 기반으로 탄생
![](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2Fc0fab6bd-59be-4277-9956-84b866c0794f%2FScreenshot_20190717-015040_YouTube.jpg?table=block&id=0c444cd2-cb7d-4ab3-b922-342d86278343&cache=v2)





> [Visualizing Time Dilation](https://www.youtube.com/watch?v=5qQheJn-FHc)

> [We all move at the Speed of Light](https://youtu.be/au0QJYISe4c)






