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 ...

Curious Kids is a series for children of all ages. If you have a question you'd like an expert to answer, send it to ...

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

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

Most of the universe’s hydrogen and helium atoms formed around 400,000 years after the Big Bang, which is the name for when scientists think the universe began, about 14 billion years ago.

Discover how CPL’s ongoing free ScienceConnections series inspires hands-on STEAM learning for kids through creative programs ...

The question of where atoms comes 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.