A crew on a spacecraft watches a movie that is two hours long. The spacecraft is moving at high speed through space. An Earth-based observer watching the movie screen on the spacecraft through a powerful telescope measures the duration of the movie to be two hours.

This is important. 1. which of the following is an si base unit for measuring length? (2 points) inch gram meter mole 2. which of the following units for distance is an si unit? (2 points) centimeter foot inch yard 3. which of the following tools should a scientist use to measure an object in meters? (2 points) electronic balance pan balance tape measure thermometer