Charles Liu

Charles Liu

סופר


1.

From planetary movements and the exploration of our solar system to black holes and dark matter, this comprehensive reference simplifies all aspects of astronomy with an approachable question-and-answer format. With chapters broken into various astronomical studies—including the universe, galaxies, planets, and space exploration—this resource is an ideal companion for students, teachers, and amateur astronomers, answering more than 800 questions, such as Is the universe infinite? What would happen to you if you fell onto a black hole? What are the basic concepts of Einstein's special theory of relativity? and Who was the first person in space?

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2.
With more than 4 million people, the Phoenix metropolitan area is one of the country's largest. Surprisingly, it's also one of the most diverse and dramatic for hikers, with scenic destinations ranging from area parks, greenbelts, and preserves to high and low deserts and breathtaking mountains. This easy-to-use guide features the best scenic day hikes, determined by author Charles Liu using state-of-the-art GPS technology. These hikes are geared to every skill level, whether it's a comfortable stroll for the family or a tricky trek for the more fearless hiker. Stretching from Hidden Valley to the south to the Superstition Wilderness to the north, the book contains clear trail maps and profiles complemented by detailed descriptions and useful at-a-glance information. All roughly within an hour's drive of the Valley of the Sun, the trails highlighted in this updated edition begin right inside the city limits with popular Camelback Mountain.
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