On the left is an image of the nearby galaxy NGC 3623 taken with UV. On the right is an optical image.

On the left is an image of the nearby galaxy NGC 3623 taken with UV. On the right is an optical image.

The galaxies spiral arms — where new stars are being born — stand out in the ultraviolet wavelengths emitted by these hot objects.

On the left is an image of the nearby galaxy NGC 3623 taken with UV. On the right is an optical image. The galaxies spiral arms — where new stars are being born — stand out in the ultraviolet wavelengths emitted by these hot objects. 

IMAGE: NASA/Swift/L.McCauley, Penn State, CC BY-ND