Part 1: Describe the mass and surface temperature of the main sequence stars.
Part 2: Explain using complete sentences where on the HR diagram you would expect to find a main sequence star based on its physical properties.
Part 1: Main sequence stars can vary in mass, typically ranging from about 0.1 to 100 times the mass of our Sun. The surface temperature of these stars can also vary, with temperatures ranging from around 2,500 to 50,000 degrees Celsius.
Part 2: Main sequence stars can be found along a diagonal line running from the top left (high temperature, high luminosity) to the bottom right (low temperature, low luminosity) on the Hertzsprung-Russell (HR) diagram. The position of a main sequence star on the diagram is determined by its mass and temperature. A more massive star with a higher surface temperature would be located towards the top left of the diagram, while a less massive star with a lower surface temperature would be found towards the bottom right.