Liquid Mirrors Can Only Point Straight Up. Could Magnets Solve This Problem?

By Brian Koberlein - February 18, 2025 10:44 AM UTC | Telescopes
Astronomers have developed several versions of rotating liquid metal telescopes, which use the force of gravity and centripetal force to create a natural telescope lens. They work, but there's a downside: they can only point straight up, in the opposite direction of gravity. A new paper is investigating how electromagnets could work with magnetic fluids (ferrofluids) to shape the liquid into a spherical shape and give it more viewing angles.
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What Would Happen if a Tiny Black Hole Passed Through Your Body?

By Brian Koberlein - February 17, 2025 03:53 PM UTC | Black Holes
Some astrophysicists theorize that there are primordial black holes, leftover from the formation of the universe. These could have a fraction of the mass of stellar and supermassive black holes and could even be a partial explanation for dark matter. In a new paper, a researcher investigates what would happen to the human body if one of these black holes passed through a person. How much mass, speed and gravity would be dangerous?
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