Is Size of Space free?

Yes. Size of Space is free and does not ask you to register or hand over an email address before you can use it.

How long does Size of Space take?

One quick round, then you can leave. We file it under "A minute" — begin beside an astronaut, finish at the Local Group.

Does Size of Space work on a phone?

Yes. Size of Space works on a phone as well as it does on a laptop.

Cosmos & Scale

Size of Space

Begin beside an astronaut, finish at the Local Group

Visit neal.fun More Cosmos & Scale

neal.fun

A minute · Works anywhere

Free, no sign-up · online since 2019

What Size of Space actually is

Neal Agarwal's scroller starts next to a person in a spacesuit and works upward, adding one larger object at a time until the previous one has shrunk to a dot. Each step is drawn against the last, moving through asteroids, moons, planets, stars, nebulae and finally galaxies.

Why it is worth your time

Every step is a like-for-like comparison with the thing immediately before it, so the growth compounds and the arrival of UY Scuti lands as a real shock.

Common questions

Is Size of Space free?: Yes. Size of Space is free and does not ask you to register or hand over an email address before you can use it.
How long does Size of Space take?: One quick round, then you can leave. We file it under "A minute" — begin beside an astronaut, finish at the Local Group.
Does Size of Space work on a phone?: Yes. Size of Space works on a phone as well as it does on a laptop.
What kind of site is Size of Space?: We list it under Cosmos & Scale — zoom out until you feel small. Every step is a like-for-like comparison with the thing immediately before it, so the growth compounds and the arrival of UY Scuti lands as a real shock.

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Cosmos & Scale

Size of Space

Begin beside an astronaut, finish at the Local Group

Visit neal.fun More Cosmos & Scale

neal.fun

A minute · Works anywhere

Free, no sign-up · online since 2019

What Size of Space actually is

Why it is worth your time

Every step is a like-for-like comparison with the thing immediately before it, so the growth compounds and the arrival of UY Scuti lands as a real shock.

Common questions

Is Size of Space free?: Yes. Size of Space is free and does not ask you to register or hand over an email address before you can use it.
How long does Size of Space take?: One quick round, then you can leave. We file it under "A minute" — begin beside an astronaut, finish at the Local Group.
Does Size of Space work on a phone?: Yes. Size of Space works on a phone as well as it does on a laptop.
What kind of site is Size of Space?: We list it under Cosmos & Scale — zoom out until you feel small. Every step is a like-for-like comparison with the thing immediately before it, so the growth compounds and the arrival of UY Scuti lands as a real shock.