Spectral Analysis

Objective: To discover how spectral analysis assists scientists in gathering facts about our universe.

Background: Scientists gather evidence about our universe in a number of ways. Stars come in many different colors from blue stars, to yellow stars such as the Sun, all the way to red stars. To study starlight, astronomers use a spectroscope. This instrument consists of slit for admitting light from external sources, a group of lenses, a prism, and an eyepiece. It is able to break down starlight in a spectrum of colors, which helps scientists find out more about the star itself.

Hypothesis: Sunlight hypothesis- I think when look at the sunlight I will see a variety of colors with the diffraction grating glasses. The lens will break down the white light into a spectrum of colors.
Fluorescent and Incandescent hypothesis- I think there will be a difference in the spectrum pattern between the fluorescent and incandescent light compared to sunlight because due to the shade of light between them it will cause a different effect.

Experiment: Materials:
Diffraction grating glasses, colored pencils, assorted bulbs, gas tubes, generator

1) Look at the sun's light through the glasses. Do not look directly at the sun. Draw or describe what you see.
2) Repeat for a fluorescent and incandescent bulbs, and the gases. Draw or describe what you see.

Data: See Spectral Analysis chart on attached page.
Conclusion: 1) I can conclude that the make up of white light is really a series of colorful spectrums when seen through a prism.2) All lights sources do not produce the same results. Every light source has a different pattern and color in its own spectrum.3) Using a spectroscope is helpful in gaining information about our universe because they break down the different color spectrums of stars. If a star has more of a blue color in its spectrum than red it means that the star is moving closer to Earth. This is known as a Blue shift. If a star has more of a red color than blue its means the star is moving father away from the Earth. This is known as a Red shPift. This helps scientists learn more about other stars in the galaxy.