Scroll to begin your journey from Earth to the edge of the observable universe.
Light takes 1.3 seconds to travel from Earth to the Moon.
You could fit all the other planets in our solar system in this gap.
Light takes 8 minutes and 20 seconds to reach Earth from the Sun.
The Sun contains 99.86% of all mass in our solar system.
A radio signal to Mars takes 3–22 minutes depending on orbit position.
The gaps are getting larger now...
Jupiter is so massive it doesn't orbit the Sun — they both orbit a point in space just above the Sun's surface.
Saturn's rings are only about 10 meters thick — cosmically razor-thin.
Still scrolling?
Space is mostly nothing.
Winds on Neptune reach 2,100 km/h — the fastest in the solar system.
Keep going.
It took New Horizons 9.5 years to get here.
When Pluto was discovered in 1930, it hadn't yet completed a single orbit. It still hasn't.
You've passed all the planets.
There's nothing out here now.
Launched in 1977, still traveling. The farthest human-made object ever.
At its speed, it would take Voyager 73,000 years to reach the nearest star.
You are now further from the Sun than any human has ever been.
A vast, spherical shell of icy objects surrounding our solar system. Most comets originate here.
Now we enter interstellar space.
The nearest star is...
...still very, very far away.
If our solar system were the size of a quarter, Proxima Centauri would be a second quarter 700 feet away.
At the speed of the fastest spacecraft ever launched, it would take 18,000 years to get here.
Let's zoom out.
Contains 100–400 billion stars. Our Sun is one of them — a tiny, unremarkable yellow dwarf about two-thirds of the way out from the center.
It takes light 100,000 years to cross our galaxy. Civilization has existed for about 10,000.
Heading toward us at 110 km/s. In about 4.5 billion years, the Milky Way and Andromeda will collide and merge.
Our "Local Group" contains about 80 galaxies in a region 10 million light-years across.
Now we zoom out to the largest scale imaginable.
Contains approximately 2 trillion galaxies. The light from the most distant objects we can see has been traveling for 13.8 billion years — since shortly after the Big Bang.
Everything you've scrolled through...
Every planet, every star, every galaxy...
Is just the observable universe.
The part we can see.
The actual universe may be 250 times larger.
Or it may be infinite.
And somewhere in all of that...
...is you.
Scrolling on your phone.
👋
The Size of Space is a free interactive scrolling experience that takes you on a journey from Earth to the edge of the observable universe. Using real distances and scientific data, it visualizes the mind-bending scale of the cosmos — from the Moon (384,400 km away) to the observable universe (93 billion light-years across, containing roughly 2 trillion galaxies).
Simply scroll down to travel through space. You'll pass the Moon, the planets of our solar system, Voyager 1 (the farthest human-made object), nearby stars, our Milky Way galaxy, the Andromeda galaxy, and finally the observable universe. A live distance counter tracks how far you've traveled, and a progress bar shows your position along the journey. All distances and facts are based on real astronomical data.
The observable universe is approximately 93 billion light-years in diameter. It contains an estimated 2 trillion galaxies. The light from the most distant objects visible has been traveling for 13.8 billion years — since shortly after the Big Bang.
Proxima Centauri, the nearest star to our Sun, is 4.24 light-years (about 40 trillion kilometers) away. At the speed of the fastest spacecraft ever launched, it would take approximately 18,000 years to reach it.
If every pixel on screen represented 1 kilometer, you would need to scroll continuously for over 4,000 years to cover the diameter of the observable universe. This experience compresses that unimaginable scale into a few minutes of scrolling.
If you enjoyed this, try these: Ocean Depth · Center of Earth · Earth in a Day · Gravity Playground
Last updated: March 2026 · whatifs.fun — Free interactive games, experiments & simulations