M100

The most distant galaxy - 13 billion light years. Photo: Hubble Space Telescope/NASA/European Space Agency

The Hubble Space Telescope celebrates 20 years in space

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As the sun weakens, cosmic radiation at flight altitude strengthens

Project 365 - counting to 100: three exemplary spiral galaxies

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As the sun weakens, cosmic radiation at flight altitude strengthens

A supernova used to calibrate distances in the universe was discovered in M100

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