In mid 18th century and later France was divided into three large social groups of Estates i.e. first estate, second estate and third estate. The First Estate comprised clergy class. They provided religious services to the societ…
In 14th and 15th century Europe was engulfed in enlightenment era. Many exploration was done in search of new continent or specifically in search of colony. This was the time when American continent was discovered and…
Since Independence(1947), India has witnessed tremendous evolution in its foreign policy. Different leaders, at different time, carved out a specific policy for foreign affairs which suited India's interest at particular tim…
Human social evolution has been divided into different ages, those are Paleolithic age , Mesolithic age, Neolithic age, Chalcolithic age and later bronze Age. This categorisation is based on human occupation, tools and social str…
In 1933, a Swiss American astronomer, Fritz Zwicky, found that mass of stars of Coma cluster of galaxy was only one percent of the mass needed to prevent galaxies escaping from gravitational pull of cluster. These observation w…
In July 1969, a NASA spacecraft Apollo-11 hit the lunar surface and first time a man walked on the Moon surface. In 1960s and 70s, due to various lunar missions, scientists started to understand moon's character…
In 1930, a object was discoverd in our solar system which was the farthest at that time. By the time eight planet had been already known in solar system and it was placed at 9th and named as Pluto . By the end of 20th…
In 1964, two physicists A. Penzias and R . Wilson were working in lab on microwave telecommunications. They found A static background interference with their transmission. They were very unaware of the cause of this interfere…
Pic: Pixabay.com What is light? Well, since ages, different kind of concepts have been developing to understand and explain this phenomenon but fundamentally, light is a tool which help us to see the things. Basic…
Every matter and energy is made of elementary particles. Elementary particles are categorised in fermions those carry matter, and bosons those carry forces. Further fermions are subdivided into quarks and leptons …
Elementary particles can be considered to those particles whose subdivision is not possible. Before 20th century, atom was considered the building block of any matter. Further research and experiment showed that even …
In 17s century, Sir Isaac Newton brought tha concept of gravity which was well defined and well accepted. According to his theory every object with mass attract another object. And that force is gravitational force. Gravitational…
Motion is the most fascinating and frequent phenomenon of the universe. It was studied by several scientists and philosopher in history. But the understanding of motion got revolutionised when sir Isaac Newton proposed three law…