Why Wasn't the Intracluster Medium in Galaxy Clusters Discovered Until

question 24

Multiple Choice

Why wasn't the intracluster medium in galaxy clusters discovered until the 1960s?

• A)We did not know how much dark matter existed before then.
• B)We didn't have the resolution to observe galaxy clusters until then.
• C)The Milky Way was blocking our view of distant galaxy clusters.
• D)The medium emits X-rays,which are blocked by the Earth's atmosphere and require X-ray satellites in space in order to be observed.
• E)Radiation emitted by the medium was so dim that we couldn't detect it until we built much larger telescopes.

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