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'Herculean' 2.5-billion-pixel mosaic shows our closest galactic neighbor like never before — and took more than a decade to create

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A new image of Andromeda has been released by the European Space Agency .

It shows the spiral galaxy "almost edge-on," tilted 77 degrees compared to how we normally see it from Earth .

The new image will enable scientists to better understand Andromeda 's past.

Andromeda could have as many as 1 trillion stars, which is up to 10 times more than the Milky Way.