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Universe Size Comparison

The observable universe is about 93 billion light-years across, roughly 930,000 times wider than the Milky Way. The red supergiant Betelgeuse is about 761 times wider than the Sun, and the Sun is 109 times wider than Earth.

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How big is each object?

This universe size comparison chart lists 15 entries from the largest to the smallest:

Object	Size	vs 5 ft 7 in man
Observable universe	93 billion light-years across	515 septillion×
Andromeda Galaxy	152,000 light-years across	842 quintillion×
Milky Way	100,000 light-years across	553 quintillion×
TON 618 (black hole)	1,600 AU across	140 trillion×
Solar System	60.2 AU across	5.26 trillion×
VY Canis Majoris	13.2 AU across	1.16 trillion×
Betelgeuse	7.09 AU across	620 billion×
Rigel	0.735 AU across	64.3 billion×
Sagittarius A* (black hole)	15,800,000 miles (25,400,000 km) across	14.9 billion×
Sirius A	1,480,000 miles (2,380,000 km) across	1.39 billion×
Sun	865,000 miles (1,393,000 km) across	814 million×
Jupiter	86,900 miles (139,800 km) across	81.8 million×
Earth	7,920 miles (12,740 km) across	7.45 million×
Moon	2,160 miles (3,475 km) across	2.03 million×
Neutron star	12.4 miles (20 km) across	11,700×

What is the biggest thing in the universe?

The biggest single structures are galaxy filaments and walls, chains of galaxies billions of light-years long. The largest known stars, like VY Canis Majoris, are over 1,000 times wider than the Sun.

How big is the Sun compared to other stars?

The Sun is an average star. Betelgeuse is about 761 times wider, while Proxima Centauri, the nearest star, is only about 1.5 times wider than Jupiter.

How many humans would it take to cross the observable universe?

About 515 septillion (5.1 × 10²⁶) adult humans lying head to foot would stretch across the observable universe.

Universe Size Comparison chart

Free to use with a link back to Height.compare.

Where do these numbers come from?

Sizes are typical adult or reported values, rounded for readability. Read how we measure and compare sizes.