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They are left over from the formation of stars and planets billions of years ago. Before zipping around the Sun with their characteristic big tails, comets that we see in our solar system start out as big chunks of rock and ice just floating around in something called the Oort Cloud. When the gravity from a large passing body, like a star, becomes strong enough, some large chunks of ice get pulled away from the cloud and head toward the Sun. As that ball of ice gets close enough to the Sun, its heat begins to melt some of the ice that makes up the comet. The melted ice becomes a gaseous tail that extends away from the source of the heat (in this case, the Sun). The tail is pushed out by the Sun's solar wind. What keeps the comet in motion and guides its path is the gravity from all the planets and stars it passes. When a comet is in our solar system, most of the gravity affecting the comet's motion is due to the Sun. As a comet gets closer to the Sun it moves faster and faster, because the closer an object is to the Sun the stronger the Sun's gravity acts on it. As well as moving faster near the Sun, the comet's tail will grow in length since more of the ice will be evaporating.

Scope is wide. Salaries varies from 15k-250000 Lacs per month. There are lot of openings in different countries. Experience is the base of all. Try to get more experience, then job offers and pay scale increases. A few fields where production engineer get placed are :
Automobile companies- For inspection, quality control, operation of automated equipments etc. Manufacturing industries- For inspection, quality control, operation of automated equipments, to control assembly line, production management etc. Food processing industries- For inspection, quality control, Production management etc. Railways- Manufacturing processes and its control etc. Process industries. Space and other research organizations. Government and private companies. Defense. IT companies. Almost every year many Government Public Sectors recruits Production Engineers as Management Trainee or Executive Trainee. Some of the known Public Sectors are as follows:-
NTPC (National Thermal Power Corporation)
ONGC (Oil and Natural Gas Corporation)
SAIL (Steel Authority of India Limited. )
There are other manufacturing and production companies of Government who recruits frequently. Government vacancies are few but not nil at any time. Almost every PSU is recruiting through GATE followed by Group Discussion and Personal Interview. Top Colleges are:Indian Institute of Technology, Delhi, Indian Institute of Technology, Kharagpur, Lovely Professional University Punjab, Birla Institute of Technology and Science, Indian Institute of Technology, Roorkee, Delhi Technological University, Anna University, Vellore Institute of Technology, National Institute of Technology, Calicut, Motilal Nehru National Institute of Technology, National Institute of Technology, Rourkela, R. V. College of Engineering, BMS College of Engineering, BMS College of Engineering, Ramaiah Institute of Technology, College of Engineering, Trivandrum, Mukesh Patel School of Technology Management and Engineering - Narsee Monjee Mumbai.