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Neil deGrasse Tyson and Chuck Nice tackle fan questions about positrons, quarks in black holes, and the Big Bang's location. They also discuss the speed of light, time dilation near black holes, Earth's map orientation, and measuring the universe in centimeters.
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Quick takeaways
- Galileo and Romer's measurements accurately determined the speed of light at 186,000 miles per second.
- The speed of light defines the meter and remains constant across space and time.
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Galileo's Attempt and Romer's Measurement
Galileo attempted to measure the speed of light by timing the delay in eclipses of Jupiter. Romer made a significant measurement when he observed a thousand second delay in eclipses depending on Earth's position in its orbit. This delay was consistent with light taking 186,000 miles to travel in a second, resulting in the first accurate estimation of the speed of light.
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