The universe is expanding faster than we thought, and no one can explain why. - NBCNewsMACH
Cepheids, the astronomer Henrietta S. Leavitt had shown in a 1908 paper in the journal, pulse in direct proportion to their brightness. That means that astronomers can figure out exactly how bright a cepheid should be based on how fast it's pulsing. Then, by seeing how dim it looks from Earth, they can tell how much light it's lost along the way, and thus how far away it is., astronomers check the distance to cepheids in nearby and faraway galaxies.
What they found directly contradicts predictions made based on observations from the European Space Agency's Planck satellite, which measured the speed of the universe 380,000 years after the Big Bang."This is not just two experiments disagreeing," Riess said."We are measuring something fundamentally different. One is a measurement of how fast the universe is expanding today, as we see it.
Riess doesn't know what the missing thing is, but for now, he plans to keep refining his measurements.
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