Star Observations

Every time we look at the sky, we saw many stars. Some stars shines so bright while the others do not, this is because of the distance of the star from our planet Earth. So astronomers study and invented an equipment to explain such situations about stars. In our passed centuries, people seen changes about the sky which leads them to have their beliefs. Ancient people really love discovering in sky, so many scientists have invented many instruments to see the stars that look like a sun.

Since the dawn of recorded civilization, stars played a key role in religion and proved vital to navigation. Astronomy, the study of the heavens, may be the most ancient of the sciences. The invention of the telescope and the discovery of the laws of motion and gravity in the 17th century prompted the realization that stars were just like the sun, all obeying the same laws of physics.

In the 19th century, photography and spectroscopy — the study of the wavelengths of light that objects emit — made it possible to investigate the compositions and motions of stars from afar, leading to the development of astrophysics.

In 1937, the first radio telescope was built, enabling astronomers to detect otherwise invisible radiation from stars. The first gamma-ray telescope launched in 1961, pioneering the study of star explosions (supernovae). Also in the 1960's, astronomers commenced infrared observations using balloon-borne telescopes, gathering information about stars and other objects based on their heat emissions; the first infrared telescope (the Infrared Astronomical Satellite) launched in 1983.

Microwave emissions were first studied from space in 1992, with NASA's Cosmic Microwave Background Explorer (COBE) satellite. (Microwave emissions are generally used to probe the young universe's origins, but they are occasionally used to study stars.) In 1990, the first space-based optical telescope, the Hubble Space Telescope, was launched, providing the deepest, most detailed visible-light view of the universe.

There have been, of course, more advanced observatories (in all wavelengths) over the years, and even more powerful ones are planned. A couple of examples are the European Extremely Large Telescope (E-ELT), which is planned to start observations in 2024 in infrared and optical wavelengths. Also, NASA's James Webb Space Telescope – billed as a successor to Hubble – will launch in 2018 to probe stars in infrared wavelengths.

We ended this topic! Be prepared for our next discussion :)

Reference:

https://www.space.com/57-stars-formation-classification-and-constellations.html

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