Although space has always been visible to people on Earth, its distance and the limitations of technology have caused it to remain mysterious for most of human history. The advent of telescopes, spectrometers, particle detectors, and other sophisticated instruments has gone a long way toward solving many of the fascinating mysteries space holds--including what stars are made of, whether space travel is possible, and what happens inside a black hole--but there is still much more to learn. Through engaging text and enlightening fact boxes, this series examines both the past and future of space exploration.
