Science of Stars

Topics: Star, Main sequence, Sun Pages: 3 (1088 words) Published: May 9, 2011
Science of Stars2
Stars are well recognized astronomical objects in our solar system and represent building blocks of galaxies. The history and dynamics of a star in a galaxy depends on its age, distribution, and composition. The stars are responsible for elements such as carbon, nitrogen, and oxygen. A star’s life begins very small, like many more things in the universe. They begin as, apart from anything else, particles in clouds of dust and gas. They remain cold for ages. The disturbance of a comet or other object that moves through the cloud will then make particles collide and clumps will begin to form. Over the course of a million years, clumps will grow into what we call “protostar” and draw in more gases and grow even hotter. This is how stars are formed and is a point in a star’s life.

Astronomers determine composition, color, and temperature of stars and other distant objects with an essential tool called a spectroscopy. Astronomers have used this tool since the 1800’s to analyze emitted light spectra. When a star gives off light and the light splits by prism, the spectral pattern reflects a star’s composition. All stars are 95% hydrogen, so the variations in composition reveal its age, luminosity, and origin. Composition of gases can be determined by observing the light of a star.

Astronomers can determine the temperature of a star from its color and its spectrum. All stars have different colors. They have different colors due to its light radiation. There are a few different ways astronomers can determine a star’s temperature. One way is to measure a star’s color. They use three filters that transmit light in three different wavelength ranges. Astronomers then take the intensity ratio of the light. Another way to determine the temperature of a star is to examine the spectral lines in the starlight. Science of Stars3

Astronomers also use a tool called the electromagnetic spectrum to determine the composition, temperature,...
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