A massive galaxy cluster observed by the Hubble Space Telescope appears as a giant smiley face in the sky, a striking example of gravitational lensing that is helping astronomers study dark matter and distant galaxies.
Hubble Space Telescope Captures Giant Smiley Face Galaxy Cluster
A massive galaxy cluster observed by the Hubble Space Telescope appears as a giant smiley face in the sky, a striking example of gravitational lensing that is helping astronomers study dark matter and distant galaxies.
Hubble Space Telescope · Wikimedia — licence per file · rights
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