Observational astronomy is an aspect of the astronomical science that involves looking into the sky with technical equipment for celestial object and taking data recordings. Theoretical astrophysics involves finding and analysing the measurable implication of physical models (Kaler 300). In simpler terms, it is the observation of astronomic objects using telescopes and other astronomic apparatus. It started when Galileo Galilei faced his telescope to the sky and recorded everything that he observed. Ever since technology has improved and better astronomical equipment have been produced. The goal of this essay is to elaborate on how astronomers use three different types of EMR when studying and analysing the stars. This is because different telescopes observe different wavelengths of light and each wavelength displays different objects in the universe.
Our solar system is a vibrant and an exciting space which is filled with asteroids, planets, black holes, quasars, comets, and other wonderful things. Many scientists have for the past centuries studied the stars through the discovery of new and advanced telescopes which enhanced them to refine older discoveries. Astronomers usually use several types of telescopes when observing the universe. Furthermore, light usually comes in different wavelengths that range from short wavelengths to long wavelengths (Kaler 200). The light us human being see with our naked eyes is in the center of the range. The X-rays and gamma-rays are used to observe short wavelengths, while radio waves and microwaves are used to observe longer wavelengths. However, most astronomers who are amateurs usually use optical telescopes which are either refractors or reflectors to observe objects in the visible range.
Radio telescopes usually collect long-wavelength light used to investigate various things; they convert the waves collected into pictures. It is surprising that majority of objects present in space emits radio noise; thus this means that they produce waves in the light spectrum of the radio range. They are large and look like dish-type antennas. Additionally, scientists build and locate them far away in space so as to avoid interfering with TVs and radios. A special technique that is used in only radio telescopes known as interferometry; it enables the astronomers to combine findings from two telescopes that are located far apart for one another to create an image that a person can think was created from just one radio telescope. This proves that radio telescope can be used to observe incredibly small details (Kouveliotou et al. 350).
Gamma-ray and X-ray telescopes usually collect light present in short wavelengths. Both of them do not work as expected on the surface of the earth because their short wavelengths get weakened and disrupted in the atmosphere. Therefore, scientists put these telescopes in space where the atmosphere does not alter them. The popularly used telescope in a lot of astronomy researches is the reflecting telescope. It uses either a combination or just one mirror to reflect the light emitted from the image to the observer. The way this telescope is designed enables astronomers to observe objects that are in space and do not produce a lot of light (Hammond World Atlas Corporation 150).
In conclusion, light usually carries various information; it enables the observer to know the various objects that exist in the space, their brightness, their composition, their hotness, their dense, how they move and the strength of their magnetic fields. With the help of radio telescopes, X-ray and Gamma-ray telescopes and reflector telescope astronomers have been able to study and analyze the stars clearly and extensively.
Hammond World Atlas Corporation. Hammond World Atlas. [Union, N.J.]: Hammond World Atlas Corporation, 2008.
Kaler, James B. Stars and Their Spectra: An Introduction to the Spectral Sequence. Cambridge, UK: Cambridge University Press, 2011. Print.
Kouveliotou, Chryssa, Ralph A. M. J. Wijers, & Stanford E. Woosley. Gamma-ray Bursts. Cambridge: Cambridge University Press, 2012. Print.