Stars_black_holes_and_galaxies
Our universe is defined by stars. This topic explores how they came to be and where they end up. This includes a discussion of black holes and galaxies.
Things in our universe can be unimaginably large and small. In this topic, we'll try to imagine the unimaginable!
Earth_geological_and_climatic_history
What is the Earth made up of and how do we know? What causes the seasons? Are there longer-ranging cycles in Earth's climate?
Life_on_earth_and_in_the_universe
When and how did life emerge on Earth? How did humanity develop a civilization? Is there other intelligent life out there?
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