The sun is approximately 25,000 light years away from the centre of the milky way and moves around it, in an approximately circular path, in roughly 170 million years. let m be the mass of the galactic matter within a radius of 25,000 light years from the galactic centre. given that sunlight take approximately 8 min to reach the earth, what is the ratio of m to the mass of the sun? (a) 1.5x10 (b) 5x10 (d) 5x1012 (c) 1.5x1012

Simon is writing a story about an astronaut whose spacecraft has been boarded by space pirates. the astronaut has her lucky penny in her hand behind her back as the space pirates break into the control room. she has just locked the controls so that the ship is accelerating in the direction of the control room’s ceiling. simon wants the astronaut to use the penny to hit a button on the control panel to turn off the lights and escape. the button is located a short distance behind and below the astronaut’s hands. how should simon use the theory of relativity to describe what the astronaut must do in order to hit the button?