When we look at intergalactic space, evidence for dark matter is everywhere. It is in the rotation of galaxies, which cannot be explained by observable matter alone. It is in the way galaxies cluster together and the path of light as it travels through the Universe. We can’t see dark …
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When you imagine the Solar System in your head, most people think of the Sun, motionless and stationary in the center, with everything else buzzing around it. But each body in the Solar System also exerts its own gravitational pull on the star, causing it to move only slightly. Therefore, …
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Across the Universe, there are numerous examples of galaxies coming together in colossal mergers, a billion-year-old process that stains stars and gas in the surrounding space. For the most part, we know how this unfolds, but we don’t know what happens to supermassive black holes within their galactic centers. Astronomers …
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