NASAのインスタグラム(nasa) - 2月19日 10時21分

Twinkle, twinkle, many stars! Several stars and distant galaxies are visible in this Hubble Space Telescope (@NASAHubble) view of a galaxy cluster. The light from the galaxies in the cluster has become redshifted by the expansion of space, making them appear redder than they actually are. By measuring the amount of redshift, we know that it took more than 5 billion years for the light from this galaxy cluster to reach us. The light of the galaxies in the background had to travel even longer than that, making this image an extremely old window into the far reaches of the universe.
Credit: ESA/Hubble & NASA, RELICS

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