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 3 · The runaway cosmos
Fun Fact
Cosmic ingredients: Normal matter—everything we can see, touch, and study—makes up less than five percent of the entire universe.
Glossary
dark energy (noun)
A theoretical repulsive force that counteracts gravity and causes the universe to expand at an accelerating rate. In 1998, astronomers discovered this force while measuring the light from distant Type Ia supernovae.
A theoretical repulsive force that counteracts gravity and causes the universe to expand at an accelerating rate. In 1998, astronomers discovered this force while measuring the light from distant Type Ia supernovae.
Quiz
What term did Albert Einstein invent in 1917, later calling it his 'biggest blunder', which now describes dark energy?
Quiz
Who were the lead astronomers awarded the 2011 Nobel Prize in Physics for discovering cosmic acceleration?
Quiz
In what year did astronomers shock the world by discovering that the universe's expansion is accelerating?
Quiz
Which Nobel Prize-winning discovery proved that gravity is losing the cosmic tug-of-war against dark energy?
Quiz
What type of dying star did researchers use as 'standard candles' to measure cosmic distances and discover dark energy?