Magnitude is related to the amount of seismic energy released at the hypocenter of the earthquake. It is based on the amplitude of the earthquake waves recorded on instruments which have a common calibration. The magnitude of an earthquake is thus represented by a single, instrumentally determined value.
20,000km. In the round-trip travel time of light between Earth and Pluto (at a distance of 40 A.U.), how far would a spacecraft orbiting Pluto at a speed of 0.5 km/s travel in that time? A ) 20,000 km
