Astronomers at the University of Tokyo have used gravitational lensing to measure how fast the universe is expanding, adding weight to one of cosmology's most intriguing mysteries. Their technique exploits the way massive galaxies bend light from distant quasars, creating multiple distorted images that arrive at different times. The measurement supports recent observations showing the universe expands faster than predictions based on the early universe suggest, strengthening evidence that the "Hubble tension" represents genuine new physics rather than experimental error.

Researchers have discovered that a close encounter with a rogue planet or brown dwarf during the Sun's early years could have triggered the reshuffling of our Solar System's giant planets. Running 3000 simulations of stellar flybys, the team found that substellar objects passing within 20 astronomical units of the young Sun could destabilise the planets' orbits just enough to match their current configuration without destroying the delicate Kuiper belt. This flyby scenario represents a new possible explanation for one of the Solar System's defining events, with roughly a 1-5 percent probability depending on how common free floating planets actually are in young star clusters.

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From the 1200s to the 1990s, elephant deaths have had a strange place in history.