scientists

astronomy – How do we know what the sun is made of?

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How do we know what the Sun is made of? You look up at the Sun and see a brilliant, featureless light. Yet, you are actually looking at a massive nuclear furnace composed of a specific cocktail of elements. We know exactly what is inside this sphere without ever having taken a physical sample. Astronomers … Read more

astronomy – What is dark matter and how do we know it exists?

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Decoding Dark Matter: The Invisible Engine of the Universe When you look at the night sky, you see stars and galaxies. However, that visible light accounts for less than 5% of the universe. The vast majority of our cosmos is composed of something we cannot see: dark matter. It is not just a scientific curiosity, … Read more