What is space-time?
What is space-time?
May 20, 2021
livescience.com
45K views · 4.6K reactions | Last week, NASA astronaut Bob Behnken and station Commander Chris Cassidy stayed 2 hours ahead of their spacewalk timeline, working with speed and precision. Tomorrow, they'll float out to finish the work they started. Listen as Cassidy explains how it happened on the first time the duo suited up together, then learn how to watch: https://go.nasa.gov/2VbKzs9 | International Space Station | Facebook
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45K views · 4.6K reactions | Last week, NASA astronaut Bob Behnk…
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Is traveling at the speed of light possible? Let's explore the universe's ultimate speed limit. The universe is constantly expanding. This expansion means the distances between galaxies are increasing over time, making it impossible for light to ever traverse the full observable universe as it expands faster than the speed of light beyond a certain point. In practical terms, the observable universe is limited by the speed of light, but in an ever-expanding universe, reaching every point is not p
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