Presentation on theme: "Light year is: Distance that light travels in a vacuum in one year, about 9.5 trillion km - which is used to record distances between stars and galaxies."— Presentation transcript:
MAIN SEQUENCE STAR is: A "main sequence star" is not really a type of star but a period in a stars life. When a star is in "main sequence" it is converting hydrogen into energy. It is then usually called a dwarf star. This is the longest period in a stars lifetime.
a scatter graph of stars in which the absolute magnitude (intrinsic luminosity) of stars is plotted vertically against their surface temperature (or corresponding spectral types) Hertzsprung-Russell diagram is: