A galaxy is receding from us at 27,000 km/s. What is the percentage of the speed of light the galaxy is receding from us?
The speed of light is approximately 300,000 km/s.
To find the percentage of the speed of light the galaxy is receding from us, we can use the formula:
percentage = (receding speed / speed of light) * 100
Substituting the given values:
percentage = (27,000 km/s / 300,000 km/s) * 100
percentage ≈ 0.09 * 100 ≈ 9%
Therefore, the galaxy is receding from us at approximately 9% of the speed of light.