THE AMAZING CHEMISTRY SUBJECT

Chemistry is not only most fascinating and most vital of all the subjects, it is apparently the only branch of knowledge that can bring us near the God—the creator and ruler of the universe. Chemistry lies at the heart of life and everything around us. For such reasons, it is often called "the central science". The processes in our brain, in our heart, in our stomach, and in each and every other part of our body involve countless number of intricate chemical reactions. These chemical reactions convert the food that we eat into trillions of amazing-structured tiny molecules for building body tissues and providing energy to each and every cell of our body. Similarly, The clothes we wear, the houses we live in, the air we inhale, and vehicles that transport us are all mad up of chemical materials. Likewise, the earth under our feet is comprised of rocks, minerals, and soil - all of which can be appreciated on a chemical basis only. Similarly, the sky ( upper environment that comprises new worlds ) above our head which are lying expanded to billions of light years away, and going up to the distant galaxies, are also made up of staggering variety of chemicals, not yet well understood.

ROLE OF COMETS IN THE ORIGIN OF LIFE ON EARTH

Some scientists have long held the notion that comets delivered many of the chemical building blocks of organic life. NASA's recent Deep Impact mission to comet Tempel 1 has substantially strengthened their belief. Results published in September 8, 2005 edition of Science Express, Deep Impact scientists say they have found high levels of organic chemicals beneath the surface of Tempel 1's core. They have yet to identify all of the chemicals present in the material, which was ejected on July 4, 2005, when the comet collided with a projectile released from Deep Impact spacecraft. But what they've seen so far makes it "more likely" that comets had actually seeded Earth with the chemical precursors for organic life. The entire team was amazed when it detected an unexpectedly high concentration of methyl cyanide ( CH3CN ). Biologists say methyl cyanide is a key player in reactions that lead to the synthesis of DNA. "If methyl cyanide is a particularly abundant component, it would suggest that comets could have delivered an abundance of these highly reactive compounds to the early Earth," notes Tom McCollom, a researcher at the University of Colorado at Boulder's Laboratory of Atmospheric and Space Physics. Methyl cyanide's abundance may also confirm that comets like Tempel 1 can open a window on conditions from which the sun and solar system formed some 4.6 billion years ago.
In the dust and gas that inhabits the distances between stars, hydrogen cyanide ( HCN ) is more abundant than methyl cyanide, notes Diane Wooden, an astrophysicist at the NASA Ames Research Center at Moffett Field, California. But once frigid clouds of dust and gas begin to condense, methyl cyanide begins to dominate hydrogen cyanide in the center of the cloud where sun-like stars and planets will form.
Deep Impact may be looking at the heart of the cloud that gave birth to our solar system. Deep Impact also has given planetary scientists the first direct measurements of a comet's density. The results imply that the nearly four-mile-wide nucleus is a loose ball of rubble. Global pictures of the nucleus suggest that it is built from two smaller sections that merged early in the object's history. Moreover, when the impact struck, it burrowed into a layer of loosely bound, fine icy dust that is at least 30 feet deep. The surface appears to be so brittle or porous so as to offer little or no solid support to anything that would land on it.