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Planets • Mercury is difficult to see because it is always close to the sun. • Venus is white and very bright. It is always seen rig... -
Although the Chinese are credited with having invented the rocket as early as the 3rd Century AD, it was not until the 20th Century that it ... -
Star cluster - S tar cluster: A bunch of stars (ranging in number from a few to hundreds of thousands) which are bound to each other by ...
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Radiation cannot be detected by human senses. A variety of handheld and laboratory instruments is available for detecting and measuring rad...
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