Research topic: star

star hot incandescent sphere of gas, held together by its own gravitation , and emitting light and other forms of electromagnetic radiation whose ultimate source is nuclear energy . Properties of Stars Stars differ widely in mass , size, temperature , and total energy output, or luminosity . The sun , a typical star, has a mass of about 2 × 10 33 grams, a radius of about 7 × 10 10 cm, a surface temperature of about 6,000°C, and a luminosity of about 4 × 10 33 erg/sec. More than 90% of all stars have masses between one tenth and 50 times that of the... Read more