Xem 1-20 trên 110 kết quả Solar system
  • Our solar neighborhood is an exciting place. The Solar System is full of planets, moons, asteroids, comets, minor planets, and many other exciting objects. Learn about Io, the explosive moon that orbits the planet Jupiter, or explore the gigantic canyons and deserts on Mars.

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  • Since the time of Newton the basic structure of the solar system and the laws that govern the motions of the bodies within it have been well understood. One central body, the Sun, containing most of the mass of the system has a family of attendant planets in more-or-less circular orbits about it. In their turn some of the planets have accompanying satellites, including the Earth with its single satellite, the Moon. With improvements in telescope technology, and more recently through space research, knowledge of the solar system has grown apace.

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  • The Complete Book of Our Solar System provides 352 pages of fun exercises for students in grades 1 to 3 that provide fascinating lessons about our solar system. Lessons cover topics including the planets, the sun and moon, space exploration and travel, and more! it also includes a complete answer key, user-friendly activities, and easy-to-follow instructions. --Over 4 million in print! Designed by leading experts, books in the Complete Book series help children in grades preschool-6 build a solid foundation in key subject areas for learning succss.

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  • (BQ)Ebook Teacher's friend publications: July and Aug - A creative idea book for the elementary teacher includes Making the most of it! Calendar - july and august! Summer activities! Watermelon, pizza & ice cream! 4th of july! the wild west! Our solar system! Let's eat nutriciously! A new start! Bulletin boards and more! Answer key! Thematic index to teacher's friend monthly books!.

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  • J upiter is by far the biggest planet in the solar system. It is a vast planet of swirling gases and storms of unimaginable fury. As the fifth planet out, it is the nearest gas giant, a planet made almost completely of gases, to the Sun. It is not much smaller than some of the stars called brown dwarfs. Jupiter does not shine itself, but reflects sunlight as all planets do. Even so, its huge pull of gravity holds more than 60 moons in orbit around it. Jupiter is named after the Roman king of the gods, also called Jove....

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  • Space research is one of the most evocative and challenging fields of human endeavour. In the half-century that has elapsed since the beginning of the space age, we have been exposed to wonders beyond the imagination of even the most visionary of science fiction writers. We have peered deep into the Universe and studied physics that we can never duplicate on the Earth. We have begun to understand our own Sun, and the flow of energy outward through the Solar System that is fundamental to our existence.

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  • In 140 A.D. a Greek astronomer named Ptolemy wrote that the Earth was the center of the universe. He thought all the stars, the Sun, and the Moon revolved around it. This made sense because that is how things looked in the sky from Earth. We call Ptolemy’s theory the geocentric view. It is derived from geo (Earth) and centric (center). Astronomers believed the geocentric view for 1,500 years until 1543. The Heliocentric View About 500 years ago, Copernicus found that the Earth and other planets revolve around the Sun. His theory was published in1543.

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  • NASA’s exploration of planets and satellites over the past 50 years has led to the discovery of water ice throughout the solar system and prospects for large liquid water reservoirs beneath the frozen shells of icy bodies in the outer solar system. These putative subsurface oceans could provide an environment for prebiotic chemistry or a habitat for indigenous life.

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  • Unit D: Space and technology includes Earth and Space (What is the Sun? What causes day and night? What causes seasons to change? What can you see in the night sky? Why does the Moon seem to change? What is the solar system?); Technology in Our World (What is technology? How does technology help us?...).

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  • (BQ) Ebook Space and technology: Earth and Space helps you know what is the Sun made of? What is Earth’s axis? Earth’s rotation causes night and day. Write to explain how this happens. Alike and different look at the picture of the planets in our solar system. How are the planets alike? How are they different?.

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  • (BQ) Ebook Space and technology: Planets provedes how are the orbits of the inner planets different from the orbits of the outer planets? Why is it difficult to study Venus? What makes Pluto’s orbit different from all the other planets? Gravity is the force that holds the solar system together.

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  • (BQ) Ebook Space and technology: Exploring Earth and Space helps you know why is the Sun important for living things? What is a crater? The solar system is everything that moves, or orbits, around our Sun. Alike and Different How are editions. the Sun and the Moon alike? How are they different?.

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  • Solar energy, light and heat radiation from the Sun, has been exploited by humans since ancient times using a variety of technology development than ever before. Solar radiation along with secondary resources of energy like wind and solar energy, water power and biomass, make the most of renewable energy available on earth. Only a tiny fraction of the available solar energy is used.

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  • With shortages of fossil energy and heavy biomass energy use occurring in both developed and developing countries, a major focus has developed worldwide on renewable energy systems. Currently, a heavy focus is on biofuels made from crops, crop residues and wood. Though it may seem beneficial to use renewable plant materials for biofuel, their use raises many concerns about major environmental problems, including food shortages and serious destruction of vital soil resources.

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  • Engineering for sustainability is an emerging theme for the twenty-first century, and the need for more environmentally benign electric power systems is a critical part of this new thrust. Renewable energy systems that take advantage of energy sources that won’t diminish over time and are independent of fluctuations in price and availability are playing an ever-increasing role in modern power systems.

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  • Solar electric plants shall be understood to be photovoltaic energy converters that are able to self-sufficiently satisfy a mean energy demand over a significant period of time, be it an appliance that is permanently hooked up or just for sporadic power supply of appliances. Such plants have in common that their input and output quantities fluctuate widely. They can therefore only be dimensioned on the basis of a mean value and are not able to satisfy this demand without the possibility to store energy. ...

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  • Overall structure of electrical power system is in the process of changing. For incremental growth, it is moving away from fossil fuels - major source of energy in the world today - to renewable energy resources that are more environmentally friendly and sustainable [1].

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  • The phenomenal growth and new developments in wind and solar power technolo-gies have made the second edition of this book necessary. It reflects the need for an expanded, revised, and updated version of the well-received first edition in just 5 years.

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  • During this century the human race will have to address the challenge of deeply transforming the world energy system to make it much more sustain- able and environmentally friendly than the one we currently have.

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  • Grid-connected photovoltaic power systems are power systems energised by photovoltaic panels which are connected to the utility grid. Grid-connected photovoltaic power systems comprise of Photovoltaic panels, MPPT, solar inverters, power conditioning units and grid connection equipments. Unlike Stand-alone photovoltaic power systems these systems do not have batteries. When conditions are right, the grid-connected PV system supplies the excess power, beyond consumption by the connected load, to the utility grid.[1]...

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