Kirjahaku

People may have been living in North America 30,000 years ago Archaeologists are constantly looking for information about how these early people arrived and how they survived. What is known is that the arrival of Europeans forever changed the lives of the Indigenous tribes living in America, often with tragic results. Still, many cultures endured with their languages, customs, and spiritual beliefs intact. This essential book, replete with fascinating historical images, fact boxes, and sidebars, spotlights the information about Native peoples that students of U.S. history need to know.

Black holes are neither holes nor black. They're invisible and packed with matter Future astronomers will find out many more fascinating facts about these space phenomena with this intriguing book. Carefully crafted text encapsulates the most important information about black holes, such as how scientists locate them and their significance in a star's life cycle. Amazing photographs support critical concepts and inspire a true appreciation of the spectacles of space.

For many years, people believed there were nine planets that orbited the sun. Now we say there are eight. What happened to the ninth planet, Pluto? What are the different planets like? What exactly makes a planet a planet? These are the many intriguing questions answered with this high-interest book, crafted to be accessible for readers of all levels. Young astronomers will be especially fascinated by the stunning photographs and the "Make the Grade" fact boxes.