Planetary Systems by Number of Known Planets NASA. Web Planetary Systems by Number of Known Planets. Back to Gallery. This figure shows the number of systems with one, two, three,.
• For a list of planets as used in astrology, see: Planets in astrology• For a list of supposed planets not based on scientific evidence, see: Planetary objects proposed in religion, astrology, ufology and pseudoscience• For a list of planets in fiction, see: Planets in science fiction, Stars and planetary systems in fiction and Fictional planets of the Solar System
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