courses

Tackle that seemingly endless selection of course offerings; a roundup of helpful resources and sound advice for selecting the best courses and acing them.

Why Does Mass Curve Spacetime?
From Newton to Einstein: A New View of Gravity For over 200 years, gravity was described by Newton’s law of universal gravitation.
By shahkar jalal4 days ago in Education
What Is Energy at the Most Fundamental Level?
The Classical Definition of Energy In basic physics, energy is defined as: The capacity to do work or cause change. If something can move an object, heat it, compress it, or transform it, it involves energy.
By shahkar jalal4 days ago in Education
Will the Universe Ever End?
What Does “the End of the Universe” Mean? The end of the universe does not necessarily mean sudden destruction. In science, it usually refers to a state in which:
By shahkar jalal4 days ago in Education
Can the Universe Exist Without Matter?
What Is Matter? Matter is anything that has: • Mass • Volume • Physical structure Atoms, molecules, planets, stars, and living beings are all forms of matter.
By shahkar jalal5 days ago in Education
Are Physical Laws the Same Everywhere in the Universe?
What Are Physical Laws? Physical laws are mathematical descriptions of how nature behaves. They explain relationships between quantities such as:
By shahkar jalal5 days ago in Education
Could the Universe Collapse Again?
What Does It Mean for the Universe to Collapse? A collapsing universe would mean that cosmic expansion stops and reverses.
By shahkar jalal5 days ago in Education
How Old Is the Universe Exactly?
What Does “Age of the Universe” Mean? The age of the universe refers to the time that has passed since the Big Bang — the event when space itself began expanding from an extremely hot and dense state.
By shahkar jalal5 days ago in Education
Are We Living in a Multiverse?
What Is the Multiverse? The multiverse refers to a hypothetical collection of multiple universes, each potentially having different:
By shahkar jalal6 days ago in Education
Does the Universe Have an Edge?
What Do We Mean by the “Edge” of the Universe? In everyday terms, an edge means a boundary—like the edge of a table or the shore of an ocean. But applying this idea to the universe is not straightforward.
By shahkar jalal6 days ago in Education
Is the Universe Infinite or Finite?
Understanding the Observable Universe The observable universe is the region of space from which light has had time to reach Earth since the Big Bang, about 13.8 billion years ago.
By shahkar jalal6 days ago in Education
What Existed Before the Big Bang?
Understanding the Big Bang Theory The Big Bang is often misunderstood as an explosion that occurred at a point in space. In reality, it was an expansion of space itself.
By shahkar jalal6 days ago in Education
What Caused the Big Bang?
Understanding the Big Bang Theory The Big Bang does not describe an explosion in space. Instead, it describes an expansion of space itself. At the beginning, all matter, energy, space, and time were compressed into an extremely small, hot, and dense state.
By shahkar jalal6 days ago in Education