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Archive by Article Title | Archive by Date Light-Years - an Introduction The light-year is commonly used term in popular science. What does the term mean and why is it useful? Can Sound Travel in Space? Ordinarily, the answer is no. But although sound cannot travel in a vacuum, there are conditions in space that allow sound to carry. Black Holes - an Introduction What are black holes? Do they really exist? A beginnerīs snapshot of these mysterious objects. Astronomy or Astrophysics? Astronomy or astrology? Astrobiology or exobiology? Many astronomy terms are similar, causing confusion what are the differences between these common terms? Astronomy Newsletter Sign-up The free astronomy newsletter is easy to sign up for, offering a reminder of the latest articles and forum posts. Astronomy For Dummies - Book Review Stephen P. Maran's Astronomy For Dummies is an excellent reference for those interested in taking up stargazing.
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