dark energy
Pronunciation
Noun
B2 Upper-intermediate
Quick answer
A mysterious force thought to make up most of the universe's total energy, believed to be responsible for speeding up its expansion.
Test yourself
Which word fits the gap? "Astronomers still don't know exactly what _____ is made of."
Answer: dark energy
In your own words, what does "dark energy" mean?
A mysterious force thought to make up most of the universe's total energy, believed to be responsible for speeding up its expansion.
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