An international research collaboration gathered observational data on several remote galaxies to investigate cosmic expansion. Figure 1 shows a scatter plot of their distance from Earth against their recessional velocity, with a straight line of best fit drawn.
Galaxy Data
| Distance from Earth (Mpc) | Recessional velocity (km/s) |
|---|---|
| 5.0 | 350 |
| 10.0 | 780 |
| 15.0 | 1100 |
| 20.0 | 1550 |
| 25.0 | 1820 |
| 30.0 | 2300 |
| 35.0 | 2550 |
| 38.0 | 2900 |
Use Figure 1 to estimate the recessional velocity of a galaxy that is 28 Mpc away from the Earth.