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August 20, 2025, 01:45 PM - 8 min read
Is our universe perfectly flat or does it have curvature to it like a sphere, or flare outwards like a horse saddle? That depends on how dense the universe is, and mapping galaxy clusters helps us measure the density of a hypothetical force known as dark energy.
Read moreMay 21, 2025, 02:10 PM - 6 min read
Light is electromagnetic radiation: basically, an electric wave and a magnetic wave coupled together and travelling through space-time. It has no mass. That point is critical because the mass of an object, whether a speck of dust or a spaceship, limits the top speed it can travel through space.
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