The invisible universe
Chapter 1
The mystery of missing mass
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Chapter 2
Mapping the invisible
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Chapter 3
The runaway cosmos
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Chapter 4
The ultimate fate of the universe
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YOUR GOAL
Master of The invisible universe
Ch 1 · The mystery of missing mass
Fun Fact
Dark matter abundance: Dark matter outweighs regular matter—the stuff making up stars, planets, and humans—by a ratio of five to one.
Glossary
dark matter (noun)
A hypothetical form of matter that does not interact with light, detected only by its gravitational pull. In 1933, Fritz Zwicky first proposed this unseen material while studying the Coma galaxy cluster.
A hypothetical form of matter that does not interact with light, detected only by its gravitational pull. In 1933, Fritz Zwicky first proposed this unseen material while studying the Coma galaxy cluster.
Quiz
Which Swiss astronomer first used the term 'dark matter' in 1933 while studying the Coma galaxy cluster?
Quiz
What would happen to spiral galaxies if dark matter did not exist to provide extra gravity?
Quiz
Which galaxy did Vera Rubin and Kent Ford study in detail to find the first robust evidence of dark matter?
Quiz
What did astronomer Vera Rubin observe in the 1970s that proved the existence of dark matter?
Quiz
What is the term for the normal, visible matter made of protons and neutrons that dark matter is NOT made of?