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background radiation

Cultural  
  1. Low-level radiation at the surface of the Earth that comes from cosmic rays and from small amounts of radioactive materials in rocks and the atmosphere.


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

In the 1960s Stephen Hawking demonstrated the Big Bang in theory, while Arno Penzias and Robert Wilson had detected the background radiation that proved decisive evidence of the event.

From The Wall Street Journal • Apr. 16, 2026

Prof Krawczynski wants very thin, 0.8mm pieces of CZT for his telescopes because this helps to reduce the amount of background radiation they pick up, allowing for a clearer signal.

From BBC • Dec. 11, 2025

In recent years, the foundation has funded a new observatory in Chile’s Atacama Desert to observe microwave background radiation from the big bang, and created the Flatiron Institute, which applies computational methods to scientific research.

From Science Magazine • May 15, 2024

It confirmed that the universe wasn’t infinitely old and static but rather had begun as a primordial fireball that left the universe bathed in background radiation.

From New York Times • Jan. 22, 2024

Incidentally, disturbance from cosmic background radiation is something we have all experienced.

From "A Short History of Nearly Everything" by Bill Bryson

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