Slide 1:Our Universe


Slide 2: . Introduction There are 9 planets in the solar system in milky way galaxy. They are – Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto


Slide 3:The sun path among the stars during the course of an year is called as ecliptic. Strip of the sky nearer to its path is called as zodiac. The different constellations in zodiac are given twelve names . They are called the SIGNS OF ZODIAC Sun rises near one of them every day in a month Zodiac


Slide 4:Zodiac and its signs 1) Aries – mesha 2) Taurus – vrishabha 3) Gemini – mithuna 4) Cancer – karkataka 5) Leo - simha 6) Virgo – kanya 7) Libra – Tula 8) Scorpio – vrischika 9) Sagittarius – dhanu 10) Capricorn – makara 11) Aquarius – kumbha 12) Pisces - meena.


Planets :Planets you might have seen some big steady bodies in the night shining more brightly than the stars . They are called planets. Though they appear more brighter than the stars they are not self luminous. They are nine in number.


Slide 6:Now let us learn about the nine planets


Mercury :Mercury Mean distance from the sun : 57,900,000 Equatorial diameter : 4,878 km mass : 3.5*10/20 tonnes Density : 5.4 times of water Number of moons - 0


Venus :Venus Mean distance between sun : 108,200,000 km. Mass : 4.8*10/21 tonnes Equatorial diameter : 12000. Density : 5.4 times of water. Number of moons-0


Earth :Earth Mean distance : 149,600,000 km. Equatorial diameter : 12756 km Mass : 5.9*10/21 tonnes Density : 5.5 times of water. Number of moons : 1


Mars :Mars Mean distance : 227,900,000km Equatorial diameter : 6787 km Mass : 6.5*10/20 tones Density : 3.9 times of water Number of moons : 2


Jupiter :Jupiter Mean distance : 778,300,000 km Equatorial diameter : 142.800 km Mass : 1.88*10/24 tones Density : 1.3 times of water Number of moons : 16


Saturn :Saturn Mean distance : 1,427,000,000 km Equatorial diameter : 120,600 Density : 0.7 times of water Mass : 5.6*10/23 tones Number of moons : 17


Uranus :Uranus Mean distance : 2,870,000,000 km Equatorial diameter : 52,299.6 km Mass: 8.85*10/32 tones Density : 1.7 times of water Number of moons : 15


Neptune :Neptune Mean distance : 4,437,000,000 km. Equatorial diameter : 49,500 km Mass : 1.00*10/23 tones Density : 1.77 times of water Number of moons : 8.


Pluto :Pluto Mean distance : 5,9000,000,000 km Equatorial diameter : 3000 km Mass : 1.18*10/19 tones Density : equal to water Number of moons : 1.


Slide 16:Galaxy is a group of stars and constellations which has a solar system. Our solar system is present in milky galaxy Galaxy


Slide 17:A star is a massive, luminous ball of plasma that is held together by its own gravity. The nearest star to Earth is the Sun, which is the source of most of the energy on Earth. Other stars are visible in the night sky, when they are not outshone by the Sun. For most of its life, a star shines due to thermonuclear fusion in its core releasing energy that traverses the star's interior and then radiates into outer space. Almost all elements heavier than hydrogen and helium were created by fusion processes in stars. Stars


Slide 18:A meteor typically occurs in the mesosphere, and most visible meteors range in altitude from 75km to 100km.[4] For bodies with a size scale larger than the atmospheric mean free path (10 cm to several meters) the visibility is due to the heat produced by the ram pressure (not friction, as is commonly assumed) of atmospheric entry. Since the majority of meteors are from small sand-grain size meteoroid bodies, most visible signatures are caused by electron relaxation following the individual collisions between vaporized meteor atoms and atmospheric constituents. The meteor is simply the visible event rather than an object itself. Meteors


Slide 19:A comet is a small Solar System body that orbits the Sun and, when close enough to the Sun, exhibits a visible coma (atmosphere) or a tail — both primarily from the effects of solar radiation upon the comet's nucleus. Comet nuclei are themselves loose collections of ice, dust and small rocky particles, measuring a few kilometers or tens of kilometers across. Comets have a variety of different orbital periods, ranging from a few years, to hundreds of thousands of years, while some are believed to pass through the inner Solar System only once before being thrown out into interstellar space. Short-period comets are thought to originate in the Kuiper Belt, or associated scattered disc,[1] which lie beyond the orbit of Neptune. Comets


Slide 20:Asteroids, sometimes called minor planets or planetoids, are bodies—primarily of the inner Solar System—that are smaller than planets but larger than meteoroids, but exclude comets. The distinction between asteroids and comets is made on visual appearance when discovered: Comets show a perceptible coma while asteroids do not. Asteroids


Slide 21:There is a popular story that Newton was sitting under an apple tree, an apple fell on his head, and he suddenly thought of the Universal Law of Gravity at What Really Happened with the Apple? Probably the more correct version of the story is that Newton, upon observing an apple fall from a tree, began to think along the following lines: The apple is accelerated, since its velocity changes from zero as it is hanging on the tree and moves toward the ground. ion. Newton's laws of gravity


Gravity meter :Gravity meter A device that measures local acceleration due to the Earth's gravity; it is also called a gravimeter. Such instruments fall into two categories: relative gravity meters, which are used to determine gravity differences among a number of geographic locations or changes in gravity that occur at a single location over time; and absolute gravity meters, which can measure the true value of the acceleration due to gravity at a given location and time


Mass :Mass The mass of an object is a fundamental property of the object; a numerical measure of its inertia; a fundamental measure of the amount of matter in the object. Definitions of mass often seem circular because it is such a fundamental quantity that it is hard to define in terms of something else.


Weight :Weight The weight of an object is defined as the force of gravity on the object and may be calculated as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the Newton. For an object in free fall, so that gravity is the only force acting on it, then the expression for weight follows from Newton's second law.


Slide 25:The Heliocentric Theory But, on the other hand, there had been planted, long before, the germs of a heliocentric theory. In the sixth century before our era, Pythagoras, and after him Phallus, had suggested the movement of the earth and planets about a central fire; and, three centuries later appeared in the writings of Cardinal Nicholas de Cuba. This was found by Johannes kelper . Life on earth


Slide 26:Nicolas Copernicus (February 19, 1473 – May 24, 1543) was the first astronomer to formulate a scientifically-based heliocentric cosmology that displaced the Earth from the center of the universe. His epochal book, De revolution bus erbium celestial (On the Revolutions of the Celestial Spheres), is often regarded as the starting point of modern astronomy and the defining epiphany that began the Scientific Revolution. Life on earth


Slide 27:THE END


Presentation by : J.a. Ravi Teja. :Presentation by : J.a. Ravi Teja. 9 th class ‘A’ section


Slide 29:THANK YOU