Time moves slower the closer you are to Earth. In his theory of general relativity, Einstein explained that the gravity of a large mass, like Earth, distorts the space and time around it.
In 2010, researchers placed two precise atomic clocks, one 33 centimetres higher than the other. Time moved slower for the clock closer to Earth. This confirmed that absolute time does not exist.
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Time passes differently in our mind. When we get a fright, large amounts of adrenaline released in our brain would speed up our internal clock and cause us to experience life as moving slowly.
The biggest factor influencing your time perception is attention. The more attention you give to the passage of time, the slower time seems to go. If you are distracted by something interesting, you're more likely to lose track of time.
If one looks at reality on the smallest scale, using equations of quantum gravity, time vanishes. However, we still perceive time as moving forward sequentially.
Key aspects of time are described by the second law of thermodynamics, which states that heat always passes from hot to cold. Ice cubes melt in hot water, never in reverse. A similar phenomenon might explain why we can only perceive the past, not the future.
The Science Fiction’s holy grail, Time Travel has been a popular topic in various books, movies and TV series for decades.
Time Travel is the ability to ‘travel’ between two different points of time, mostly involving a vehicle of some sort, which is able to arrive in the past or future.
Scientists know four forces - things that attract or repel one object from another. The strong force and the weak force operate only inside the centres of atoms. The electromagnetic force rules objects with excess charge, and gravity directs objects with mass.
People have long speculated about gravity. While ancient Greek and Indian philosophers observed gravity, it was the insight from Isaac Newton that made it possible to measure and predict the phenomenon.
According to physicists, quantum particles are responsible for three forces of nature:
The fourth force of nature, gravity, is till now assumed to not originate from quantum particles, but from the curves in the space-time continuum, according to the celebrated physician Albert Einstein.
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