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Gravity causes an apple to fall to the ground and keeps the moon in orbit around Earth, but it can also trap light for infinity in a dying star and ripple across the cosmos carrying the news of a massive collision between two distant black holes. With accessible language and breathtaking NASA images, students will explore the theory of gravity, from Newton's law of universal gravitation to Einstein's general relativity and beyond. This book supports...
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Mars has been visible in the night sky for thousands of years, but it is only recently that humans have begun to learn what the planet is really like. Early astronomers, believing they could see man-made canals through their telescopes, suggested that Mars was home to intelligent life. Was this true at one point in the planet's history-and could it support life in the future? Through detailed graphic organizers and full-color photographs, this volume...
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Until 1990, no one could say for certain that planets existed beyond our solar system. Today, thanks to unprecedented advancements in technology, astronomers have found more than 5,000 of these exoplanets. Some are Earth-sized, some orbit a sun-like star, and some are rocky rather than gaseous. Could any of them hold life as we know it? Full-color photographs and engaging, age-appropriate text let students explore the exciting field of exoplanet study....
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For many years, children learned in school that there are nine planets in our solar system. The ninth planet, Pluto, was discovered in 1930. However, in 2006, Pluto was demoted. Why did this happen after nearly 80 years? What sets a planet apart from an asteroid, comet, or other celestial body? What exactly is a dwarf planet-Pluto's new designation? Readers learn the answers to these questions and more through engaging text, augmented by informative...
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"Solar and lunar eclipses have been a source of fascination since ancient times. Early cultures created myths to explain what was happening, ranging from animals eating the celestial bodies to the sun leaving the sky in anger. Today, thanks to advancements in science, we understand the principles behind these astronomical events. However, this understanding has not diminished our awe and fascination. Through engaging, age-appropriate text, augmented...
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For years, people have reported seeing strange objects in the sky. Sometimes these take the form of lights or vague shapes; other times, the witnesses give detailed descriptions of what they believe to be alien spacecraft. In 2022, the United States Congress stated that reports of UFOs have been growing, but these flying objects often remain unidentified. What is the truth? Supplemented with informative graphic organizers and engaging fact boxes,...
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The moon has been a source of fascination to cultures throughout history. Thousands of years ago, people made up myths to explain what the moon was and why it changed over the course of a month. Thanks to scientific advancements over the centuries, we now know the true reasons behind these early mysteries. We also know much more about how the moon's orbit affects our planet in ways big and small. Full-color photographs, intriguing fact boxes, and...
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Although Albert Einstein predicted the existence of black holes in 1916, they remained the stuff of science fiction until astronomers definitively proved his theory in 1971. Today, although we know more about black holes, we are far from a perfect understanding of these astronomical objects. This volume utilizes engaging fact boxes and vivid full-color photographs to help young readers better understand what we know about black holes as well as what...
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Since 1992, astronomers have been discovering exoplanets at an astonishing rate. As of 2022, more than 5,000 have been identified. This has sparked humanity's collective imagination. Could any of those planets be hospitable to human life? What characteristics would these planets require if this were to become a reality? Is terraforming a viable option? This volume examines these questions and more, with informative fact boxes and enlightening graphic...
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Mars has been a source of fascination for thousands of years. Ray Bradbury's classic novel, The Martian Chronicles, was published in 1950, a full 15 years before the first up-close photographs of Mars were taken by Mariner 4. As time went on and technology advanced, scientists started to realize that a manned mission to Mars could one day be possible. However, many stumbling blocks remain before that point can be reached. Vivid full-color photographs...
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For thousands of years, people have told stories about what the stars are and where they come from, from ancient Greek myths about the constellations to the ancient Egyptian belief that a king's soul became a star when he died. However, true scientific research took place alongside these stories. Later astronomers built on this foundational research, and with the help of scientific instruments such as spectrometers, the mystery of the stars was finally...
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Asteroid collisions are not unknown to our planet. The atmosphere protects Earth from most of these heavenly bodies, but the largest ones can make it through. So far, although large asteroids have permanently altered Earth's terrain and the organisms living on it, no asteroid has yet been destructive enough to completely eradicate the planet. Is this a future possibility? What are scientists' plans in case of such an emergency? This volume examines...
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All stars have a finite life expectancy-even our own sun. Fortunately, many stars survive for billions of years. Our sun has existed for more than 4 billion years and has not yet reached the next phase of its life cycle. While it is inevitable that the sun will burn out, it will not be within the lifetime of anyone alive today. Through accessible main text, enhanced with vivid full-color photographs and informative graphic organizers, explores the...
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