dark matter
Pronunciation
Noun
B1 Intermediate
Quick answer
An invisible substance thought to make up much of the universe's mass, detected only through its gravitational effects.
Test yourself
Which word fits the gap? "Scientists infer the presence of _____ from the way galaxies rotate."
Answer: dark matter
In your own words, what does "dark matter" mean?
An invisible substance thought to make up much of the universe's mass, detected only through its gravitational effects.
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