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🌌 How does the universe work?

Follow cosmic expansion, gravity, matter, stars, galaxies, and the evidence behind our largest scientific story.

7
lessons
~30 min
to learn
🔬 Science
subject
Adults
level
Start the course →

What you’ll learn

  1. Scale, light, and looking backwardConnect light travel time, scale, and multiwavelength evidence to how astronomy knows the cosmos.Farther light is older light. Spectra and many wavelengths turn the sky into data.
  2. Gravity, orbits, and spacetimeExplain orbits, tides, black holes, and gravitational waves under gravity’s rule.Orbits are free-fall with sideways speed. Extreme gravity and spacetime ripples extend the same story.
  3. Stars: fusion engines and life cyclesDescribe stellar equilibrium, fusion, formation, and mass-dependent endings.Stars balance gravity with pressure while fusing fuels. Mass largely sets their life and death.
  4. Galaxies and the dark matter problemOutline galaxy structure and the gravitational evidence for dark matter.Galaxies are dynamical systems. Rotation curves and lensing reveal mass beyond starlight.
  5. Expansion, Big Bang evidence, and cosmic historyPresent expansion, CMB, nucleosynthesis, structure growth, and late acceleration as a coherent history.Hot early universe, relic microwaves, growing structure, and recent acceleration form the standard outline.
  6. The cosmic inventory and open questionsState the dark energy / dark matter / baryon budget carefully and name open problems.Ordinary matter is a minority. Evidence is strong; microphysical identities for dark sectors remain open.
  7. Putting the universe’s rules togetherIntegrate forces-by-scale, conservation, and scientific method as the universe’s operating system.Different forces own different scales. Measurement revises models; habitability is a rare overlap.

Questions this course answers

Why does looking farther into space also mean looking further into the past?

Finite light speed couples distance to lookback time for astronomical observations.

Match each tool to what it primarily reveals

Spectra encode chemistry and Doppler motion; other bands and deep images expand what physics we can see.

In your own words, what is an orbit?

Gravity provides centripetal acceleration; tangential speed shapes the conic-section path.

Which statement about black holes is most accurate for this course level?

Event horizons mark extreme curvature; far away, gravity depends on mass and distance like other masses.

Order a simplified massive-star story

Massive stars fuse progressively heavier fuels until collapse can power a supernova and leave a dense remnant.

Name the process that powers main-sequence stars

Fusion of light nuclei releases energy that supports stars against gravity during the main sequence.

Grounded in trusted sources

  • NASA / ESA public cosmology and astrophysics education pages (expansion, CMB, galaxies, black holes)
  • Planck Collaboration public summaries of CMB cosmology results
  • LIGO/Virgo public education materials on gravitational waves
  • Open educational astrophysics texts and university lecture notes on stellar structure and galaxy dynamics
  • Particle Data Group and major review articles (public summaries) on cosmological parameters and dark matter status

Every Wunder lesson is built from real, reputable sources — never invented.

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