Time and space are intertwined from "summary" of A Brief History of Time by Stephen W. Hawking
The idea that time and space are intertwined is a central concept in modern physics. According to this view, space and time are not separate entities but are intricately connected in a four-dimensional continuum known as spacetime. This concept was first introduced by Albert Einstein in his theory of general relativity, which revolutionized our understanding of the universe. In general relativity, gravity is not a force that acts across a distance, but rather a curvature of spacetime caused by the presence of mass and energy. This means that massive objects like stars and planets not only bend the fabric of space, but also affect the flow of time. In the presence of a strong gravitational field, time slows down relative to an observer in a weaker gravitational field. This phenomenon, known as time dilation, has been confirmed by experiments such as the observations of clocks on GPS satellites. The intertwining of time and space also has profound implications for the nature of the universe itself. According to the Big Bang theory, the universe began as a singularity - a point of infinite density and temperature - from which spacetime itself emerged. As the universe expanded and cooled, the fabric of spacetime stretched and curved, giving rise to the galaxies, stars, and planets that populate the cosmos today. In this way, the history of the universe is intimately connected to the evolution of spacetime. The concept of spacetime as a unified entity has led to many fascinating discoveries in physics, from black holes and wormholes to the possibility of time travel. By treating time and space as a single entity, physicists have been able to develop a more complete understanding of the fundamental forces and particles that govern the universe.- The intertwining of time and space is a fundamental concept in modern physics that has revolutionized our understanding of the cosmos. By viewing spacetime as a unified entity, scientists have been able to unlock many of the mysteries of the universe and push the boundaries of our knowledge to new frontiers.
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