An atom consists of a heavy center, called the nucleus, made of particles called protons and neutrons. An atom has lighter ...

Why did they form at that time? Astronomers know from observing distant exploding stars that the size of the universe has been getting bigger since the Big Bang. When the hydrogen and helium atoms ...

The question of where atoms come from requires a lot of physics to be answered completely – and even then, physicists only have good guesses to explain how some atoms are formed.

Richard Feynman, a famous theoretical physicist who won the Nobel Prize, said that if he could pass on only one piece of ...

Almost everything on Earth is made up of atoms, but where do these fundamental building blocks come from?

So, the hydrogen and helium atoms could form only once the universe cooled down to something like 5,000 degrees Fahrenheit (2,760 degrees Celsius).

An atom consists of a heavy center, called the nucleus ... close together. This property is called the strong force, and the process that sticks these particles together is called fusion. Scientists ...

Theorists move quickly to explain discrepancyTwo protons and a neutron A discrepancy between two different measurements of the charge radius of the helium-3 nucleus may have been reconciled. (Courtesy ...