Artist's impression of our galaxy, the Milky Way, with its spiral arms



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Artist's impression of our galaxy, the Milky Way, with its spiral arms
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An illustration of the Milky Way based on photographs taken by the Spitzer space telescope. It shows our Sun in the side arm called 'Orion Spur', below the light-coloured centre of the galaxy. The abbreviation 'ly' provides the distance in light years; one light year corresponds to around 9.5 trillion kilometres.

Credit: NASA/JPL-Caltech.
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