Scale

I could watch this video over and over
created by on 2015-02-18

… it puts things into perspective

Gigapixels of Andromeda

And here is zoomable version of the gigapixel image of the andromeda galaxy:
http://www.spacetelescope.org/images/heic1502a/zoomable/

Source: Hubble - Sharpest ever view of the Andromeda Galaxy

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