1. (a) An astronaut is on a spacecraft passing by earth at a constant velocity of 74 km/s (note: this is currently the record for the fastest object ever built by humans). You (at rest on earth) and the astronaut both measure the time it takes for the spacecraft to travel from St. John's, NL to Victoria, BC (a distance of approximately 7100 km in your reference frame). What is the difference between your measured time intervals? (b) How fast would the astronaut need to be traveling in order for the difference between your measurements to be 1%