You are not alone. Relax. That statement has nothing to do with the existence of extraterrestrial life though we do get around to that, too. For the present, it applies only to our mutual interest in astronomy. For we (the authors) and you (the reader) have come together because we are the kind of people who often look up at the sky and have all kinds of questions about it. But this habit hardly brands us as unique. Astronomy, the scientific study of matter in the universe, is among the most ancient of human studies. The very earliest scientific records we have from Babylon, from Egypt, from China all concern astronomy. Recorded history spans about 5,500 years, and the recorded history of astronomy starts at the beginning of that period. Humans have been sky watchers for a very, very long time. And yet astronomy is also among the most modern of sciences. [download]
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