Sai Science academy

  SOLAR SYSTEM Our planetary system is located in an outer spiral arm of the Milky Way galaxy. Our solar system consists of our star, the Sun, and everything bound to it by gravity — the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune, dwarf planets such as Pluto, dozens of moons and millions of asteroids, comets and meteoroids. Beyond our own solar system, we have discovered thousands of planetary systems orbiting other stars in the Milky Way. Beyond our own solar system, there are more planets than stars in night sky. So far, we have discovered thousands of planetary systems orbiting other stars in the Milky Way, with more planets being found all the time. Most of the hundreds of billions of stars in our galaxy are thought to have planets of their own, and the Milky Way is but one of perhaps 100 billion galaxies in the universe. While our planet is in some ways a mere speck in the vast cosmos, we have a lot of company out there. It seems that we live in a...

 BIG BANG   Most astronomers believe the Universe began in a Big Bang about 14 billion years ago. At that time, the entire Universe was inside a bubble that was thousands of times smaller than a pinhead. It was hotter and denser than anything we can imagine. Then it suddenly exploded. The Universe that we know was born. Time, space and matter all began with the Big Bang. In a fraction of a second, the Universe grew from smaller than a single atom to bigger than a galaxy. And it kept on growing at a fantastic rate. It is still expanding today. As the Universe expanded and cooled, energy changed into particles of matter and antimatter. These two opposite types of particles largely destroyed each other. But some matter survived. More stable particles called protons and neutrons started to form when the Universe was one second old. Over the next three minutes, the temperature dropped below 1 billion degrees Celsius. It was now cool enough for the protons and neutrons to come toget...

 ABOUT SPACE In space, no one can hear you scream. This is because there is no air in space it is a vacuum. Sound waves cannot travel through a vacuum. 'Outer space' begins about 100 km above the Earth, where the shell of air around our planet disappears. With no air to scatter sunlight and produce a blue sky, space appears as a black blanket dotted with stars. Space is usually regarded as being completely empty. But this is not true. The vast gaps between the stars and planets are filled with huge amounts of thinly spread gas and dust. Even the emptiest parts of space contain at least a few hundred atoms or molecules per cubic metre. Space is also filled with many forms of radiation that are dangerous to astronauts. Much of this infrared and ultraviolet radiation comes from the Sun. High energy X-rays, gamma rays and cosmic rays – particles travelling close to the speed of light – arrive from distant star systems.

  Crop production and management Crops - When a plant of same kind is cultivated at one place on a large scale is known as crop Based on seosons which they grow, there are three kinds of crop- Kharif crop, Rabi crop and Zaid crop Kharif Crops: The crops which are grown in the rainy season (i.e., from June to September) are called Kharif crops. Paddy, maize, soybean, groundnut, and cotton are Kharif crops. Rabi Crops: The crops are grown in the winter season (i.e., from October to March) are called rabi crops. Examples of rabi crops are wheat, gram, pea, mustard, and linseed. Zaid Crops (or Summer Crops): The crops grown in the summer season are ( called zaid crops. Moong, muskmelon, watermelon, cucumber, gourd and bitter gourd are examples of zaid crops. Agricultural practices Soil Preparation:  It involves loosening and tilling of the soil (i.e., ploughing and watering). Sowing:  Sowing is the process of putting seeds in the soil. Adding Manure and Fertilisers:  The...

  Branches of science The  branches of science , also referred to as  sciences , "scientific fields", or "scientific disciplines," are commonly divided into three major groups: Formal sciences : the study of  formal systems , such as those under the branches of  logic  and  mathematics , which use an  a priori , as opposed to  empirical ,  methodology . Natural sciences : the study of natural phenomena (including cosmological, geological, physical, chemical, and biological factors of the universe). Natural science can be divided into two main branches:  physical science  and  life science  (or  biological science ). Social sciences : the study of  human behavior  in its social and cultural aspects Links are linked to Wikipedia 

  What are the 8 branches of science Oceanology. The study of oceans. genetics. The study of heredity and DNA. Physics. The study of motion and force. zoology. The study of animals. Astronomy. The study of stars. Marine biology. The study of plants and animals that live in the ocean. botany. The study of plants. geology.

  The study of and knowledge about the physical world and natural laws. Science is  the study of the nature and behavior of natural things and the knowledge that we obtain about them . A science is a particular branch of science such as physics, chemistry, or biology. Physics is the best example of a science which has developed strong, abstract theories. Main Branches of science - Physics Biology Chemistry Social Science