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Dark Energy

The Universe

Cosmology is the study of the Universe. It doesn't look at small objects, like stars or planets. It investigates the Universe on a large scale.

Many, many galaxies against a black background. Some are tiny dots, and they range in size all the way up to small spheres or swirls. They have different shapes, some more spiraled than others, whilst some appear like smudged lines. They range in colour from red, orange, white, green, and blue.
This work by NASA/ESA/G. Illingworth/D. Magee/P. Oesch (University of California, Santa Cruz)/R. Bouwens (Leiden University)/HUDF09 Team is licensed under Creative Commons Attribution 4.0 International
The Hubble eXtreme Deep Field (XDF). Covering an area less than 1/10 of the Moon's width, the image contains about 5,500 galaxies.