2. Progress of Astronomy

    I talk about the remarkable development of this study. What do people would have studied in astronomy state-of-the-art? Since it is very diverse, it is possible to introduce all difficult.

Neptune.

    Newtonian physics since been established, people understood that the earth around it around the sun. Because they knew that the planet like Jupiter is a movement different from other stars, I noticed that the planets around the sun around. March 13, 1781, William Herschel discovered Uranus in the telescope. Motion of the planet was strange. Scientists knew that the orbit of the planet is not a perfect circle, but even so the orbit of this planet was disturbed unnatural. Scientists expect another planet is lacking the power to this planet from the outside. And they calculated the orbit of an unknown planet. Result, astronomers have found Neptune. This star is the first planet whose existence was revealed by calculation.
 
    There is a learning called spectroscopy. By analyzing the spectrum of light, this study can predict the properties of the light source. This is established in the mid-19th century, scientists began to allow observation of the stars in more detail.They were able to predict that the star is that whether they contain any element. Speed ​​of a star could also be predicted from the Doppler effect of light they.

Radio telescope, ALMA.

    19th century, photography was invented. Astronomers looked faint stars invisible to the human by using the photograph.They began to observe the galaxy and nebula in earnest. In addition, in 1931, Karl Jansky found that celestial body is emitting radio waves. He was a physicist cruncher wireless technology. His discovery, made ​​a study of radio astronomy. Certain radio has the property of passing through the obstacle or reaches farther than the light. This property was convenient to observe celestial bodies invisible disturb the nebula celestial bodies and not the emitted light. In this way, observation target people began increasing.

Albert Einstein.

     From modern, astronomy was the quest for knowledge. That the new discovery will lead to the discovery of the next there were many. There was also a theory until it is overturned. For example, inadequacies of Newtonian mechanics is modified by Einstein's theory of relativity. Unfortunately, this theory of Einstein is famous but difficult, most people may not understand. We found that the time and space that distorted the time being. For curiosity not for life, scientists wanted to know the mechanism of the universe. In fact , bodies far away even if what sort would be little that it is involved in our lives. But so it 's good. Because it was something interesting for scientists.




The sources: 
http://en.wikipedia.org/wiki/History_of_astronomy
http://gigazine.net/news/20110817_astoronomy_discoveries/

The pictures:
 http://photojournal.jpl.nasa.gov/jpegMod/PIA00046_modest.jpg
http://alma.mtk.nao.ac.jp/j/multimedia/files/editor/2013_alma_0001.jpg