Cartwheel galaxy, multi-wavelength image
Cartwheel galaxy, multi-wavelength image. Around 100 million years ago, a smaller galaxy passed directly through the centre of the Cartwheel galaxy. This caused shock waves to propagate out through the galaxy, which caused bursts of star formation. The bright blue ring marks the region where huge, powerful ultraviolet-emitting stars have formed. The inner orange ring is the second wave, but this has far less star formation than the first wave. It is not known if the colliding galaxy was one of the two at lower left. The images were taken in X-rays by the Chandra Space Telescope (purple), in UV by GALEX (blue), in green light by the Hubble Space Telescope, and in infrared by the Spitzer Space Telescope (red).
© Nasa/Jpl-caltech/Science Photo Library
USA, North Carolina. Sunrise at Botany Bay Plantation Heritage Preserve. Credit as
USA, North Carolina. Sunrise at Botany Bay Plantation Heritage Preserve. Credit as: Marie Bush / Jaynes Gallery / DanitaDelimont(Large format sizes available)
© Marie Bush / Jaynes Gallery / DanitaDelimont.com
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Barred Spiral Galaxy NGC 1672 in Dorado
NGC 1672 is a prototypical barred spiral galaxy in the constellation Dorado, and differs from normal spiral galaxies in that the spiral arms do not twist all the way into the centre. Instead, they are attached to the two ends of a straight bar of stars enclosing the nucleus.
© Robert Gendler/Stocktrek Images
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