The Evolving Universe

Smithsonian Institution

A Universe of Galaxies

Whirlpool Galaxy • M51

M51 image

Credit: Harvard-Smithsonian CfA

Observers: Brian McLeod

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  • Distance from Earth: 23 million light years
  • Size: 76,000 light years
  • Telescope: MMT/Megacam
  • Light: Visible

Did You Know?

What Was Happening Then?

Light from the Whirlpool Galaxy takes 23 million years to reach Earth.

When the light we observe now left the Whirlpool Galaxy, mammals—including horses and whales—were evolving into diverse species.

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Related Exhibit


The Explore the Universe exhibition at the Smithsonian National Air and Space Museum

Learn more about human exploration of the universe. Visit the Explore the Universe exhibit at the Smithsonian National Air and Space Museum or online.