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Milestones in space 016<br />

018<br />

020<br />

022<br />

Observatories<br />

024<br />

10. Most massive<br />

galaxy cluster<br />

"EI Gordo" is the nickname of<br />

a galaxy cluster 7 billion light<br />

years away. Discovered via<br />

a disturbance in the cosmic<br />

microwave background, El Gordo<br />

is actually two clusters colliding<br />

at a rate of several million km/h.

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