The average distance from Earth to Pluto is about 5.9 billion kilometers (3.7 billion miles). The speed of light is approximately 299,792 kilometers per second (186,282 miles per second).
To calculate the time it takes for light to travel from Earth to Pluto, we can divide the distance by the speed of light:
Time = Distance / Speed of light
Time = 5.9 billion kilometers / 299,792 kilometers per second
This calculation gives us approximately 19,671 seconds, or about 5.46 hours.
Therefore, if you were looking at Earth from Pluto, you would be observing it as it appeared approximately 5.46 hours ago. Keep in mind that this calculation assumes a direct line of sight and does not account for factors such as the orbital positions of Earth and Pluto, which can affect the actual time it takes for light to travel between the two.