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How long will it take, in years, until today's Hubble radius has expanded to 9 times its current size? Assume complete Dark Energy domination during

How long will it take, in years, until today's Hubble radius has expanded to 9 times its current size? Assume complete Dark Energy domination during this time, using the current value of H0 = 70 km/s/Mpc. Your answer should be in years and must be in scientific notation and include one decimal place (2 sig fig)

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