A common modern measurement for the Hubble constant is 68 km s−1 Mpc−168\text{ km s}^{-1}\text{ Mpc}^{-1}68 km s−1 Mpc−1.
What is the value of this measurement in units of s−1\text{s}^{-1}s−1?
Given: 1 parsec=3.1×1016 m1\text{ parsec} = 3.1 \times 10^{16}\text{ m}1 parsec=3.1×1016 m
2.2×10−212.2 \times 10^{-21}2.2×10−21
2.2×10−182.2 \times 10^{-18}2.2×10−18
2.2×10−122.2 \times 10^{-12}2.2×10−12
4.6×10174.6 \times 10^{17}4.6×1017
