SPACE ATLASSTUDENT REFERENCE · GRADES 4–8
Galaxies · Question

Where are we in the Milky Way?

Earth isn't near the galaxy's center, and it isn't anywhere especially unusual either. Here's our actual address, zoomed out one step at a time.

Visual model

Our galactic address.

How far from the galactic center are we?

Move a hypothetical location along a radial line. The Sun's reference position stays fixed at approximately 26,000 light-years from the center, within the Orion Spur.

Schematic radial position within the Milky Way A conceptual circular galactic disk with a radius marked as about 50,000 light-years, the Sun marked around 26,000 light-years from the center, and an adjustable hypothetical distance marker. This does not map real spiral arms. Center Sun ≈ 50,000 ly
Center · 0Nominal disk edge · 50,000 ly
Hypothetical distance: 0 light-years · 0% of a nominal galactic disk radius.

This is a radial ruler, not an observed photograph of the Milky Way. The circle is a nominal 100,000-light-year disk and the directions, arm positions and hard outer boundary are not measured here. The 26,000-light-year Sun distance is approximate.

Reference: NASA Goddard — Our Milky Way. NASA explains that its structure is inferred from measurements made while we are inside the disk.

What's simplified

The map is fuzzier than it looks.

01

We can't take a photo of it

We're inside the Milky Way's disc, so its overall spiral shape is mapped indirectly — through star positions, motions, and radio surveys — not photographed from outside.

02

Arm boundaries are fuzzy

Spiral arms are regions of higher star density, not walls — where one arm ends and another begins is not a sharp line.

Misconception check

Quick check.

Quick check

Go deeper

Keep exploring.

Galactic distance

How do astronomers measure light-years?

Use the distance ladder to interpret how far the Sun is from the galactic center.

Understand light-years ↗