Author: Elizabeth Whitworth

What are the strong and weak anthropic principles? Do they resolve the fine-tuning problem? Models for the big bang theory imply that the initial conditions of the universe would have had to be precisely right for habitable planets to form. Stephen Hawking argues that this need for fine-tuning indicates a problem with the big bang theory. He discusses anthropic principles in an effort to address the problem. Read more to learn about the anthropic principles.

Where are scientists in their attempts to develop a unifying theory? Is string theory the answer? Hawking asserts that the ultimate goal of science is to develop a “unifying theory” that can be applied in any context. Scientists have made progress towards this goal but have not yet achieved it. In the meantime, they use two major theories. Hawking discusses the limitations of each of these theories as well as some of the attempts to create a unified theory.  Read more to learn about a unifying theory in science.

What is wave-particle duality? How does it affect the theory of relativity? Physicist Stephen Hawking discusses the wave-particle duality, explaining how small particles act like both particles and waves. Because of this duality, general relativity doesn’t accurately model the behavior of small particles. Hawking describes the famous double-slit experiment, which demonstrates that particles act like waves. Keep reading to learn about wave-particle duality.

What is the uncertainty principle? Why is it impossible to predict the position and velocity of a subatomic particle with absolute certainty? Stephen Hawking, in his book A Brief History of Time, discusses the origins and basic principles of quantum mechanics. He shows how quantum mechanics gives rise to the uncertainty principle and explains how uncertainty can limit the accuracy of predictions in physics. Read more to learn about the uncertainty principle.