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It was four all along: More arms in Milky Way than...

A 12-year study of large stars has reaffirmed that our Galaxy has four spiral arms, following years of discussion sparked by pictures taken by NASA's Spitzer area Telescope that solely showed 2 arms.

How Engineers Revamped Spitzer to Probe Exoplanets

Now approaching its 10th anniversary, NASA's Spitzer Space Telescope has evolved into a premier observatory for an endeavor not envisioned in its original design:...

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