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Galaxies

Bacteria, whale and universe

Understanding Scale: From Planck to Cosmic

Learn measuring the scale of everything, from the very tiny to the super gigantic!

Milky Way galaxy as seen from Australia (Brett Ritchie via Unsplash)

The Milky Way

In 2019, scientists discovered that our galaxy, the Milky Way, is not the shape they thought it was. How do astronomers use astronomical distance to understand the shapes of galaxies?