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是日靚相

NGC 281 is a bright emission nebula in the northern constellation of Cassiopeia, at a distance of 9200 ly from the Solar System. The partial superimposition of a dark nebula makes it resemble Pac-Man.

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是日影音

A video of a galaxy forming in an astrophysical simulation.
Since our Universe moves too slowly to watch, faster-moving computer simulations are created to help find out. This video from the IllustrisTNG simulations tracks gas from the early universe until today. As the simulation begins, ambient gas falls into and accumulates in a region of relatively high gravity. After a few billion years, a well-defined center materializes from a strange and fascinating cosmic dance. Gas blobs – some representing small satellite galaxies – continue to fall into and become absorbed by the rotating galaxy as the present epoch is reached and the video ends.

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