Astronomy

The universe is essentially fascinating and its mysterious phenomenon has always given rise of to human curiosity to explore and unmask it. A number of theories and hypotheses have been put forth to explain the nature ,origin and fate of the universe and its components like galaxies ,constellations ,etc .Inventions like telescope,manned and unmanned spacecraft etc . are being  great helful for space exploration but still we know very little about the universe  as it is very fast .According to Albert Einstein ,no object can travel faster than light.The velocity of light in vacuum is 3*10^8 m/s.Even at this speed ,light takes some thousands years to travel the distance between the stars .Now we can easily imagine how the distance between the stars.
All the aggregate of all existing or the whole creation embracing all the celestial bodies(heavenly bodies) and all of the space is called the universe .
The universe  consists of everythings  including earth ,solar system,constellations ,galaxies,etc.Solar system in the universe is like a very fine particle.Nobody knows the size and the limit of the  universe .The sun is the nearest star near to the earth ,which is the main source of energy.It is medium sized star out of the billions of stars that make up the universe .The sun is too large that if it is a hollow ball , we could  place more  than one billion earth into it .it is 1.5*10^8 km away from the earth . All the planets  of the solar system  revolve around the solar system in their elliptical orbits.

chemistry

he scope of chemical science

Chemistry is too universal and dynamically-changing a subject to be confined to a fixed definition; it might be better to think of chemistry more as a point of view that places its major focus on the structure and properties of substances— particular kinds of matter— and especially on the changes that they undergo.

In some ways, physics might be considered more "fundamental" to the extent that it deals with matter and energy in a more general way, without the emphasis on particular substances. But the distincion can get pretty fuzzy; it is ultimately rather futile to confine any aspect of human endeavour to little boxes.

Chemistry: the central science

The real importance of Chemistry is that it serves as the interface to practically all of the other sciences, as well as to many other areas of human endeavor. For this reason, Chemistry is often said (at least by chemists!) to be the "central science".

Chemistry can be "central" in a much more personal way: with a solid background in Chemistry, you will find it far easier to migrate into other fields as your interests develop.