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Noteextra

All articles tagged with #noteextra

New Evolution Model Could Rewrite Earth's Life Timeline
science6 days ago

New Evolution Model Could Rewrite Earth's Life Timeline

Researchers Budd and Mann propose the Covariant Evolutionary Tempo model, which allows evolutionary rates to vary and accelerate during major diversification, potentially resolving the mismatch between fossil records and genetic timelines. If correct, many modern species may descend from ancestors that evolved rapidly in bursts, challenging the idea of a steady molecular clock. The concept, which could explain a roughly 30-million-year discrepancy, is yet untested but prompts a major reevaluation of when key lifeforms appeared.

Down in Space Is Relative: Planes, Orbits, and the Cosmic Bearings
science6 days ago

Down in Space Is Relative: Planes, Orbits, and the Cosmic Bearings

There isn’t a universal ‘down’ in space. The solar system lies in a flattened disk (the ecliptic) because the collapsing rotating solar nebula shaped planets to orbit in roughly the same plane. The Milky Way has its own galactic plane (tilted about 60° to the ecliptic), and the Local Group sits in a nearly perpendicular supergalactic plane (about 84.5° to the galactic plane). Orientation of these planes comes from the initial rotation of matter when clouds collapsed, so every star, planet, and galaxy can have its own plane and direction depending on where you’re looking.