Sunday, 22 January 2017

AKASGANGA AND SAURMANDAL RELATED IMP QUIZ NUMBER -3 BY EXAM ZONE

AKASGANGA AND SAURMANDAL RELATED IMP QUIZ NUMBER -3 BY EXAM ZONE

The Sun is the star at the center of the Solar System. It is a nearly perfect sphere of hot plasma with internal convective motion that generates a magnetic field via a dynamo process. It is by far the most important source of energy for life on Earth. Its diameter is about 109 times that of Earth, and its mass is about 330,000 times that of Earth, accounting for about 99.86% of the total mass of the Solar System About three quarters of the Sun's mass consists of hydrogen (~73%); the rest is mostly helium (~25%), with much smaller quantities of heavier elements, including oxygen, carbon, neon, and iron.

The Sun is a G-type main-sequence star (G2V) based on its spectral class, and is informally referred to as a yellow dwarf. It formed approximately 4.6 billion years ago from the gravitational collapse of matter within a region of a large molecular cloud. Most of this matter gathered in the center, whereas the rest flattened into an orbiting disk that became the Solar System. The central mass became so hot and dense that it eventually initiated nuclear fusion in its core. It is thought that almost all stars form by this process
.
The Sun is roughly middle-aged: it has not changed dramatically for more than four billion[a] years, and will remain fairly stable for more than another five billion years. After hydrogen fusion in its core has stopped, the Sun will undergo severe changes and become a red giant. It is calculated that the Sun will become sufficiently large to engulf the current orbits of Mercury, Venus, and possibly Earth.

The enormous effect of the Sun on Earth has been recognized since prehistoric times, and the Sun has been regarded by some cultures as a deity. The synodic rotation of Earth and its orbit around the Sun are the basis of the solar calendar, which is the predominant calendar in use today.

The sun is a big star. At about 864,000 miles (1.4 million kilometers) wide, it could hold 109 planet Earths across its surface. If the sun were a hollow ball, more than a million Earths could stuff inside it. But the sun isn't hollow. It's filled with scorching hot gases that account for more than 99.8 percent of the total mass in the solar system. How hot? The temperature is about 10,000 degrees Fahrenheit (5,500 degrees Celsius) on the surface and more than 28 million degrees Fahrenheit (15.5 million Celsius) at the core.
click here for download here

MUKHYA SEVIKA,TALATI,CONSTABLE & ALL EXAM MOST IMP PART 11 BY MISSION EXAM (JARJIS KAZI & YASH DODIYA)

MUKHYA SEVIKA,TALATI,CONSTABLE & ALL  EXAM MOST IMP PART 11 BY MISSION EXAM (JARJIS KAZI & YASH DODIYA) BUY ONLINE BOOKS C...