The universe is expanding faster than we thought
The Hubble constant measures the universe's expansion, but puzzling discrepancies in its value hint at new physics, challenging our understanding of the cosmos.
The Hubble constant measures how fast the universe is stretching, a key to understanding its age and future. Named after Edwin Hubble, who observed distant galaxies moving away faster the farther they are, this constant is currently estimated around 70 kilometers per second per megaparsec. This means for every megaparsec (about 3.26 million light-years) a galaxy is from Earth, it recedes 70 km/s faster.
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