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Learning path

Understanding the Universe

The scientific story of the cosmos — how it began, how it evolved, and how we know. Each lesson connects to real cosmology entities, with the scientific consensus made explicit.

Beginner
  1. 1.1The UniverseWhat we can see, and how far it reaches.
  2. 1.2The Big BangHow the Universe began 13.8 billion years ago.
  3. 1.3ExpansionWhy space itself is stretching.
  4. 1.4GalaxiesHow gravity built the cosmic web.
Intermediate
  1. 2.1StarsThe first stars and how they lit up the cosmos.
  2. 2.2Black HolesWhere gravity wins and light cannot escape.
  3. 2.3Dark MatterThe unseen mass that shapes galaxies.
  4. 2.4Dark EnergyThe mystery accelerating the expansion.
Advanced
  1. 3.1RelativityEinstein's foundation for all of cosmology.
  2. 3.2CosmologyThe standard model of the Universe.
  3. 3.3Modern ObservationsReading the oldest light in the Universe.
  4. 3.4The Future of the UniverseWhere an accelerating cosmos is heading.

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History of Astronomy →Understanding Stars →