Answer:
2.5 million kelvins
Explanation:
The data revealed X-rays from these distant sources are absorbed selectively by oxygen ions in the vicinity of the galaxy. The scientists determined the temperature of the absorbing halo is between 1 million and 2.5 million kelvins, or a few hundred times hotter than the surface of the sun.
The 20th century is marked to be the era of inventions and there was progress in every walks of life. Many inventions have made our life to be more easy and comfortable. Most of the inventions today have become obsolete but they were remembered for the convenience it rendered during such harsh times of early nineteenth century. Examples of obsolete inventions like typewriters, ether ice machines which serves to be the model for the modern refrigerators, Humphrey Davy who invented electric lamp.
Explanation:
After the second industrial revolution there were too many inventions like invention of the first revolver, sewing machine, battery, safety pin, steam powered locomotives. Steam locomotives by George Stephenson, changed the way of life which led to commercialization and emergence of huge factories. Transportation was made feasible during the late eighteenth century. Invention of Radio is considered to be the top most of all inventions. Although it was not invented by a single person but a group scientists have contributed for its discovery. In modern world, the invention of television is also revolutionary.
It was invented by John Logie Baird in 1926. during the twentieth century, the greatest marvel of discovery was made by inventing computers but the model of which is invented in olden times by Charles Babbage. The invention of cell phones By Doctor Martin Cooper in 1977 made communications to be faster and people are connected from different parts of the world through cell phones and computers. Nearly half of the world holds a cell phone toady.
The primary reason for European colonization of Africa was capitalism. European nations saw an opportunity for new trade routes and potential wealth in some of Africa's natural resources. The geographical limitations of Europe were also a factor.
<h2><u>Answer:</u></h2>
The correct option is D (Euclid)
<h3><u>Explanation:</u></h3>
Euclid, here and there given the name Euclid of Alexandria to recognize him from Euclides of Megara, was a Greek mathematician, regularly alluded to as the "author of geometry" or the "father of geometry". He was dynamic in Alexandria amid the rule of Ptolemy I.
Despite the fact that Euclid is a well known mathematician, next to no is thought about his life. It is trusted that he was an understudy of Plato. Euclid was conceived around 365 B.C. in Alexandria, Egypt and lived until around 300 B.C. Euclid's most well known work is his gathering of 13 books, managing geometry, called The Elements.
