The base component of matter, comprising a nucleus of neutrons and protons, which is orbited by electrons. The electromagnetic force holds the particles in the atom together.
Atom Quotes in A Brief History of Time
The A Brief History of Time quotes below are all either spoken by Atom or refer to Atom. For each quote, you can also see the other terms and themes related to it (each theme is indicated by its own dot and icon, like this one: Note: all page numbers and citation info for the quotes below refer to the Bantam edition of A Brief History of Time published in 1988.).
Chapter 5 Quotes
We now know that neither the atoms nor the protons and neutrons within them are indivisible. So the question is: what are the truly elementary particles, the basic building blocks from which everything is made?
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Atom Term Timeline in A Brief History of Time
The timeline below shows where the term Atom appears in A Brief History of Time. The colored dots and icons indicate which themes are associated with that appearance.
...explained the random movement of dust in liquid was caused by the dust and liquid atoms colliding. J. J. Thompson at Cambridge had already proven the existence of electrons, and later... (full context)
...and positive, they repel each other, while opposite charges attract each other. On the small, atomic scale, electromagnetic forces dominate all activity. This force arises from the exchange of photons. Real... (full context)
...yet incorporated gravity. But gravity is a weak force and doesn’t factor much on the atomic scale. Yet, because its effects build up, for large structures, gravity wins out, which is... (full context)
...in on itself under its own gravity—usually it is mostly hydrogen. The increasing number of atomic collisions taking place as the gas contracts causes it to heat up. Soon, it there... (full context)
...escape the strong nuclear force and began to form into the nuclei of heavy hydrogen atoms, followed by atoms of heavier elements. George Gamow first proposed this model with Ralph Alpher... (full context)
...be stronger than particles’ energy to escape it, drawing more particles together to form more atoms. In denser than average regions of the universe, the gravitational force of this clumping matter... (full context)
...into smaller clouds and collapse, due to their own gravity. Contraction would force collisions between atoms, raising the particles’ temperature, starting nuclear fusion reactions. This would transform hydrogen into helium, creating... (full context)