Chapter
The Expanding Universe and Faster-than-Light Travel
1:31:52 - 1:37:25 (05:33)
The expanding universe can make it appear like light is traveling faster than the speed of light, but at any given point locally, light is not exceeding that limit. However, distant objects can appear to move away from each other faster than the speed of light in an accelerating universe.
Clips
The space between galaxies, or clusters of galaxies, is expanding in an expanding universe.
1:31:52 - 1:34:01 (02:09)
Astronomy
Summary
The space between galaxies, or clusters of galaxies, is expanding in an expanding universe. This means that the observable universe has a radius of 45.7 billion light years despite the universe's age being only 13.7 billion years.
ChapterThe Expanding Universe and Faster-than-Light Travel
Episode#137 – Alex Filippenko: Supernovae, Dark Energy, Aliens & the Expanding Universe
PodcastLex Fridman Podcast
The speed of light is not actually being exceeded, as locally it always moves at the same speed.
1:34:01 - 1:37:25 (03:24)
Science
Summary
The speed of light is not actually being exceeded, as locally it always moves at the same speed. It is the expanding universe that causes the appearance of light to travel faster than the speed of light in certain conditions.