Nothing facts for kids

This three-dimensional map offers a first look at the web-like large-scale distribution of dark matter, an invisible form of matter that accounts for most of the Universe's mass.

This image shows the Abell 2744 galaxy cluster, a huge collection of galaxies.

Have you ever looked into an empty cookie jar and felt a little sad because there was "nothing" left? Or have you ever stared up at the dark night sky and wondered what lies in the giant gaps between the stars? It seems like a simple idea, right? "Nothing" is just what you have when you take everything else away. But for scientists, mathematicians, and philosophers, "nothing" is one of the most complicated and exciting topics in the entire universe!

In this big adventure of an answer, we are going to look at "nothing" from every angle. We will see how it works in math, how it hides inside your own body, and why even the emptiest parts of outer space are actually full of surprises. Grab your thinking cap, because we are about to dive deep into the mystery of the void!

"Empty" Box: Why Your Eyes Deceive You

A molecule moving because of heat. Molecules are always moving, spinning, and vibrating, especially when they are warm.

Let’s start with something you see every day. Imagine you have a cardboard box. You take out your toys, you shake out the dust, and you close the lid. You might say, "There is nothing in this box." But if a scientist walked into the room, they would politely disagree with you.

Even though you can’t see anything, that box is actually crammed full of stuff! First, there is air. Air is made of trillions and trillions of tiny molecules like oxygen (which helps you breathe) and nitrogen. If there were truly "nothing" in the box, it would be a vacuum, and the air pressure from the outside would probably crush the box flat!

Inside that "empty" box, there are also other things you can’t see. There are radio waves from your Wi-Fi router passing through the cardboard. There are tiny particles of light called photons bouncing around. There might even be microscopic bits of skin or pollen floating in the air.

So, in our daily lives, when we say "nothing," we usually just mean "nothing that I care about right now." We use the word to describe an absence of objects, but in the world of science, a box full of air is definitely "something."

Zero: The Hero of "Nothing" in Math

For a long time, humans didn't even have a way to write down "nothing." If you were a merchant in ancient times and you sold all your apples, you just had... no apples. You didn't need a number for it.

But as math got more complicated, people realized they needed a placeholder. Imagine trying to write the number 105 without a zero. It would just look like 1 5. How would you know if it was fifteen, one hundred and five, or one thousand and five?

The invention of zero was a total game-changer. It started in ancient civilizations like the Babylonians and the Maya, but it was the mathematicians in India, about 1,500 years ago, who really treated zero like a "real" number. They realized that zero isn't just a blank space; it’s a tool.

Think about your computer or your tablet. Everything you see on the screen—the games, the videos, the colors—is made of just two things: 1s and 0s. This is called binary code. In this system, the "0" represents an "off" switch and the "1" represents an "on" switch. Without the mathematical concept of "nothing," we wouldn't have the internet, Minecraft, or YouTube! Zero is the "nothing" that makes all our modern technology possible.

The Great Illusion: You Are Mostly Empty Space

This is the part that usually blows people's minds. If you tap on a table, it feels solid. If you hit a baseball with a bat, it’s definitely "something" hitting "something." But if we look at the atoms that make up the table, the bat, and even your own body, we find that they are almost entirely made of nothing.

An atom has a tiny center called a nucleus, and even tinier electrons zooming around it. But the distance between the nucleus and the electrons is huge compared to their size.

Imagine a huge football stadium. If the nucleus of an atom were the size of a small marble sitting right in the middle of the 50-yard line, the electrons would be like tiny gnats buzzing around the very highest seats in the stands. Everything in between the marble and the gnats—the field, the seats, the air—is just empty space.

If you took all the people on Earth (all 8 billion of us!) and removed all the empty space inside our atoms, the entire human race would fit inside the size of a single sugar cube. However, that sugar cube would be incredibly heavy because it would still have the mass of 8 billion people!

So, why don't we fall through the floor if we are mostly empty space? It’s because of forces. The electrons in your shoes and the electrons in the floor push away from each other like magnets. You aren't actually "touching" the floor; you are hovering a tiny, tiny distance above it because the forces are pushing you up. You are a collection of "somethings" held together by "nothing," floating on a cushion of energy!

Outer Space: Is the Vacuum Truly Empty?

A large vacuum chamber used for testing spacecraft.

When we think of "nothing," we often think of the "void" of outer space. We call it a vacuum. In a vacuum, there is no air to breathe and no sound can travel (because sound needs air to "wiggle" through).

But even in the deepest, darkest parts of the universe, between the galaxies, it isn't truly empty.

• The Interstellar Medium: There are always a few stray atoms of gas and bits of dust floating around. It’s very lonely, but it’s not "nothing."
• Radiation: Space is crisscrossed by light from stars, X-rays from black holes, and the "afterglow" of the Big Bang (called the Cosmic Microwave Background).
• Gravity: Even if there are no particles, the "fabric" of space itself is there. Gravity is a force that curves space. If there were "nothing," there would be no space to curve!
• Dark Matter: Scientists have discovered that there is a mysterious "stuff" called dark matter that we can't see or touch, but it fills up a huge part of the universe.

So, even the "Great Nothing" of space is actually a very busy place!

Quantum Physics: The Boiling Soup of Nothing

Now we are getting into the really weird stuff. Scientists who study the smallest particles (Quantum physicists) have found that even if you could create a "perfect" vacuum—a box with absolutely no atoms, no light, and no heat—it still wouldn't be empty.

According to the laws of physics, space itself has energy. This energy is constantly "boiling." Tiny particles called virtual particles are constantly popping into existence out of nowhere, hitting each other, and disappearing again in a fraction of a second.

Imagine a sea of soap bubbles. The bubbles are constantly appearing and popping. From far away, the surface looks still and empty, but if you look closely, it’s a chaotic mess of activity. This is called Quantum Fluctuations.

This tells us that "absolute nothing" might be impossible in our universe. Nature seems to "hate" a vacuum. Whenever there is a truly empty spot, the universe tries to fill it with these tiny, ghostly particles. This means that "nothing" is actually a very unstable state that is always trying to become "something."

The Big Bang: Did Everything Come from Nothing?

Timeline of the universe. A representation of the evolution of the universe over 13.77 billion years.

One of the biggest questions in all of science is: "Where did the universe come from?"

Most scientists believe in the Big Bang Theory. This theory says that about 13.8 billion years ago, the entire universe—all the stars, planets, and even the space they sit in—started as a tiny, tiny point that was unimaginably hot and dense.

But what was there before that? Some scientists think that the universe might have started from a "quantum fluctuation" in a state of "nothingness." It’s like the universe was a giant bubble that suddenly popped into existence out of the quantum soup we talked about earlier.

If that’s true, then everything you see—your friends, the trees, the moon—is just a very organized version of "nothing" that got very big and very complicated!

Philosophy: Can We Even Think About Nothing?

Philosophers are people who love to think about thinking. They have been arguing about "nothing" for thousands of years. One famous philosopher named Parmenides said that "nothing" cannot exist, because as soon as you talk about it or think about it, you are making it "something."

Try this experiment: Close your eyes and try to imagine "nothing."

• Did you imagine a black screen? Black is a color, so that’s something.
• Did you imagine a dark, empty room? A room is a place, so that’s something.
• Did you imagine a white void? White is also a color.

Our brains are built to understand things, places, and times. We literally don't have the "software" in our heads to imagine a true lack of existence. To us, "nothing" is just a word we use to describe the gaps between the "somethings."

The Mystery Remains

So, can "nothing" actually exist?

If you mean "nothing" like an empty pocket, then yes, it exists all the time! But if you mean "absolute nothing"—no space, no time, no energy, no particles—then the answer is probably no. Our universe is so full of energy and forces that even the emptiest spot is still "something."

The next time you feel bored and say there is "nothing to do," remember that you are a walking, talking miracle made of "mostly nothing," living in a universe that grew out of "nothing," using a brain that can't even imagine "nothing."

Isn't that something?

Related Ideas

• Existentialism
• Nihilism
• No
• Vacuum
• Zero

See also

In Spanish: Nada para niños