wunder beta🌌 The Universe
The Big Bang, dark matter, dark energy, and the fate of everything.
What you’ll learn
- Define the universe, explain the Big Bang, and describe the cosmic microwave background and scale.The universe is all matter, energy, space, and time, born 13.8 billion years ago in the Big Bang. The cosmic microwave background is its leftover glow, and the observable universe spans about 92 billion light-years across.
- Explain cosmic expansion and describe dark matter and dark energy and the cosmic recipe.Galaxies rushing apart reveal an expanding universe. Dark matter (about 27 percent) is felt through gravity, dark energy (about 68 percent) accelerates expansion, and ordinary matter is only about 5 percent.
- Describe cosmic structure, how the age is measured, and possible fates of the universe.Gravity built galaxies into a vast cosmic web. Independent methods agree the universe is 13.8 billion years old, and its fate, likely endless expansion, depends on dark energy.
Questions this course answers
About how old is the universe?
Multiple independent measurements place the universe's age at about 13.8 billion years.
What was the Big Bang?
The Big Bang was the rapid expansion of space itself, not an explosion within existing space.
What is the cosmic microwave background?
It is the faint afterglow of the early universe, released about 380,000 years after the Big Bang.
What did the recession of distant galaxies reveal?
Distant galaxies moving away, faster with distance, shows space itself is expanding.
Why do scientists believe dark matter exists?
Galaxies rotate too fast to be held together by visible matter, implying unseen mass adds gravity.
What is dark energy thought to be doing?
Dark energy appears to be accelerating the expansion of the universe, discovered in the late 1990s.
Grounded in trusted sources
- NASA Science, "What is Dark Energy?" (science.nasa.gov/dark-energy)
- Big Think, "How we know the Universe is 13.8 billion years old" (bigthink.com/starts-with-a-bang)
- Discover Magazine, "The Universe Started as a Hot Soup of Particles and Photons 13.8 Billion Years Ago"
- Forbes / Ethan Siegel, "If The Universe Is 13.8 Billion Years Old, How Can We See 46 Billion Light Years Away?"
- NASA Science, "Galaxies" (science.nasa.gov/universe/galaxies)
Every Wunder lesson is built from real, reputable sources — never invented.
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