unlocked puzzles of science

Introduction We don't know what happened at the exact instant of the big bang. However, over the last few decades physicists have pushed our understanding back further and further to very beginning of time and applied the known laws of physics to arrive at the rough timeline of what happened during the very early evolution of the universe. The vast majority of scientists believe in the  big bang theory  , which would have started the universe we know. According to the theory, about 13. 7 billion years ago all the matter that constitutes the universe was concentrated in the single point, which exploded, giving rise to everything we know. Before our universe existed, there would be another one before it, which also emerged from a supermassive point, expanded and began to shrink, reaching the singularity of the big bang.  The universe is 13.7 billion years old, with a margin of error of 0.2 billion more or less. To reach this figure, scientists have struggled for almost 80 years.  The

 Introduction For as long as humans have been grazing at the night sky, the question of how far can see into it has fascinated astronomers. The revolutionary observations made by Edwin Hubble in the late 1920s were the first direct evidence that the universe was not static. The systematically increasing spectroscopic redshift observed in increasingly distant galaxies was a clear sign that the universe expands. Because the universe is expanding, the sphere of what we can see is not defined simply by the age of the universe multiplied by the speed of the light. This is because the universe is expanding ;the distance between every point of the fabric of spacetime is forever increasing, a growth that affects the paths of photons. For a long time this expansion was believed to be slowing down due to the combined gravitational pull exerted by all the matter in the universe. However, at the end of the 1990s the measured dimming of Type la supernovae with increasing redshifts revealed that thi

Introduction The vast empty space surrounding the planets and stars is called as the universe. It consists of dark matter,dark energy ,stars and galaxies. Both cyclic and unpredictable processes are found to happen in the universe. Cosmology is the study of nature and origin of the universe. Thousands of years before smartphones or Mario Kart, people entertained themselves by peering at the night sky and connecting the stars to create pictures called constellations- of animals ,objects and legendary heroes. Today ,the heavens are no less entertaining but a bit mysterious mystery where so many great minds working to solve the unlock puzzles of secrets. Universe is believed to have originated about 15 billion years ago through big bang (Lemaitre,1931) or thermonuclear explosion of an extremely sense entity. It began to expand. Cosmic material is still expanding. Big Bang theory The 'big bang' is the name for the leading  theory behind the birth of everything:atoms,light ,gravity

 Introduction The periodic table of the elements is one of the most powerful icons in science ; a single document that consolidates much of our knowledge of chemistry.For over a century, millions of children have started out every year on their journey into the fascinating world of chemistry with the periodic table of the chemical elements. Hundreds of versions of the periodic table have been proposed, and a variety of methods have been applied to its analysis.Throughout its long history, the periodic table has been disputed, altered and improved as science has progressed and as new elements have been discovered. But despite the dramatic changes, no revolution in the basic nature of the periodic system. After evolving for over 200 years through the work of many people, the periodic table remains at the heart of the study of chemistry  It ranks as one of the most fruitful ideas in the modern science. Efforts of many physicists and chemists  The modifications to quantum theory made by We