wunder beta🌌 The Cosmos
From the Big Bang to galaxies, dark matter, and an accelerating universe.
What you’ll learn
- Describe the origin of the universe and how matter and structure formed.The universe began 13.8 billion years ago and expanded and cooled, releasing the cosmic microwave background. The Big Bang made mostly hydrogen and helium; stars forged heavier elements, and gravity assembled stars, galaxies, and the cosmic web.
- Explain cosmic expansion, dark matter, and dark energy.Hubble showed space is expanding, pointing back to the Big Bang. Dark matter's gravity holds galaxies together, and dark energy drives the accelerating expansion discovered in 1998. Ordinary matter is only about 5 percent of the universe, and new telescopes keep testing these models.
Questions this course answers
About how old is the universe?
Measurements of the cosmic microwave background and expansion rate put the universe's age at about 13.8 billion years.
What is the cosmic microwave background?
The CMB is ancient light freed about 380,000 years after the Big Bang, stretched into microwaves by cosmic expansion.
Where were elements heavier than helium mostly made?
The Big Bang made mainly hydrogen and helium; heavier elements were forged in stars and scattered by supernovae.
What did Hubble's observations of distant galaxies show?
Hubble found that farther galaxies recede faster, evidence that space itself is expanding.
Why do scientists infer the existence of dark matter?
Galaxies spin faster than their visible mass can explain, so unseen dark matter must supply extra gravity.
What did the 1998 supernova studies reveal about the universe?
Distant supernovae showed the expansion is speeding up, attributed to dark energy.
Grounded in trusted sources
- NASA Science, 'Universe Overview' (science.nasa.gov/universe/overview)
- NASA Science, 'What is Dark Energy?' (science.nasa.gov/dark-energy)
- Institute of Physics, 'The Big Bang' (iop.org)
- NASA/Hubble, 'Hubble and the Big Bang' (science.nasa.gov/mission/hubble)
- Space.com, 'Our Expanding Universe: Age, History & Other Facts' (space.com)
Every Wunder lesson is built from real, reputable sources — never invented.
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