A mind-blowing explanation of the speed of light | Michelle Thaller | Big Think

TL;DR

Mass increases as you approach the speed of light due to the equivalence of energy and mass.

Transcript

So, Tom, you asked the question, "How does mass increase as you go faster?" And this is really a wonderful part of Einstein's theories. It actually is also relatively slippery and kind of complicated because to even answer this question at all, we have to ask the rather strange question: "What do you mean by mass? What is your definition of mass?" ... Read More

Key Insights

• 🙂 Mass cannot travel at the speed of light, but pure energy in the form of photons can.
• 🙂 Time slows down and space contracts as an object approaches the speed of light.
• 💆 Mass is a measurement of energy, and an object's mass increases with its kinetic energy.
• 💆 The equation E = mc² shows the equivalence between energy and mass.
• 💨 The increase in mass is only observed by external observers, not by those on a fast-moving object.
• 💆 Objects returning to a slower speed would revert to their original mass.
• 💆 The concept of relativistic mass explains the change in mass at high speeds.

Questions & Answers

Q: Why can't anything with mass travel at the speed of light?

Objects with mass cannot reach the speed of light because their mass would become infinite as they approach this speed.

Q: Does mass actually increase when an object gains speed?

No, an object's mass does not increase when it gains speed. The observed increase in mass is due to the additional energy of motion.

Q: How does time and space change as an object approaches the speed of light?

As an object moves closer to the speed of light, time slows down, and space contracts, eventually reaching a singularity.

Q: Does mass change depending on the observer's perspective?

Yes, the concept of relativistic mass accounts for the measurement of an object's rest mass and the additional energy of its high speed, leading to different mass values from different perspectives.

Summary & Key Takeaways

• Mass cannot travel at the speed of light because as objects approach the speed of light, their mass increases and would become infinite.

• As objects move closer to the speed of light, time slows down, and space contracts, eventually reaching a point of singularity.

• Mass is a measurement of energy, and as objects gain kinetic energy from motion, their mass appears to increase.