BBC Sky at Night

How is the Universe so big?

Weeks after NASA released the very first images from the James Webb Space Telescope (JWST), astronomers began reporting the discovery of extremely redshifted galaxies. As we saw in the first instalment of this series, a high redshift means the light has been travelling through the expanding Universe, getting stretched along the way, for a very long time. In other words: these galaxies are incredibly far away.

One galaxy, an

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