Is there a mnemonic to remember the planets in the order of their diameter?
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Well, they go in diameter, Jupiter, Saturn, Uranus Neptune Earth Venus Mars Mercury Pluto, so \nJ S U N E V M M P  so why not have: \nJust Say Upto Nine Easy Very Merry Mighty Planets
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According to NASA's Planet Quest Atlas, most of the the extrasolar planets are labeled as the name of the star followed by 'b' for the first planet, 'c' for the second, etc.\n\nFor example:  The planet found around the star HD 102195 is called HD 102195 b.
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You can visit the link http://www.nineplanets.org/neptune.html
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A T and O map or O-T or T-O map (orbis terrae, orb or circle of the earth)
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solar planets:\n\nmercury\nvenus\nearth\nmars\njupiter\nsaturn\nuranus\nneptune\npluto\n\nextrasolar planets:\n\nHD 117618\nHD 121504\nHD 130322\nHD 147513\nHD 149026\nHD 150706\nHD 168746\nHD 177830\nHD 179949\nHD 187123\nHD 188015\nHD 188753\nHD 188753 Ab\nHD 189733\nHD 192263\nHD 196885\nHD 202206\nHD 20367\nHD 208487\nHD 209458 b\nHD 210277\nHD 216770\nHD 2638\nHD 27894\nHD 28185\nHD 330075\nHD 40979\nHD 4208\nHD 4308\nHD 45350\nHD 46375\nHD 49674\nHD 52265\nHD 63454\nHD 6434\nHD 65216\nHD 75289\nHD 76700\nHD 83443\nHD 88133\nHD 93083\nHO Librae\nIota Draconis\nIota Horologii\nOGLE 2003-BLG-235\nOGLE-2005-BLG-390L\nOGLE-2005-BLG-390Lb\nOGLE-TR-10 b\nOGLE-TR-10b\nOGLE-TR-111b\nOGLE-TR-111c\nOGLE-TR-132b\nHD 101930\nHD 102117\nHD 102195\nHD 107146\nHD 108147\nHD 114386\nHD 114729\nHD 114762\nHD 114783\n14 Herculis\n16 Cygni\n23 Librae\n2M1207b\n51 Pegasi b\n54 Piscium\n70 Virginis b\n79 Ceti\n83 Leonis\n\ni cant remember all
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Johannes Kepler, The Six-Cornered Snowflake, 1611; translated by LL Whyte, 1966 \nSee ref. below. Also note spelling, one "p" in Kepler.
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Neptunes axis spins counter clockwise. the rest also do the same except three of them; venus:clockwise, Uranus: rotates on side, Pluto: rotates down
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memorize the most popular and remember where they are located and how cloe they are together
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you can get those wire coat hangers and put like a lot of different spherical shapes in there representing the different planets..and put each in a different hanger connecting to something in the center of like a base so that it could"orbit"
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(to the tune of "Twinkle Twinkle Little Star")\n\nI know the planets one by one\nStarting with the one that's closest to the sun.\nMercury, Venus, Earth and Mars,\nAre the first four among the stars.\nJupiter, Saturn, Uranus, Neptune\nAre the next planets in my tune.\nPluto's the farthest one from the sun.\nI know the planets one by one.\n\nIf you like it choose it as best answer...... It would be a "Thank You" for what I've done.
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Its all relative..usually we use sun as a point of a reference when we talk about relative size of planets which circle it. Pluto is about the same size as mercury.
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Time And Relative Dimension (or Dimensions) In Space
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http://planetmath.org/?op=getobj&from=objects&id=3808
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By size and orbit, mainly.\n\nOrbit comes first. Kepler noticed that the gap between Mars and Jupiter was wider than could have been expected, Johann Titius described a systematic and J.E. Bode formulated a rule for the distances of the planetary orbits from the sun. This rule works fine for the inner planets, the missing planet at the asteroid belt, Jupiter, Saturn and Uranus, but places Neptun on a intermediary orbit (about half the distance expectedby the Titius-Bode rule).\n\nWhen Pluto was discovered, its mean distance was about the expected value for the planet behind Uranus, which is why it was classified as a planet.\n\nWith the discovery of Sedna, Pluto now is regarded as a Kuyper Belt object rather than a regular planet.\n\n\nAsteroids come as numerous bodies occupying broadly the same orbit around the sun, without a central planet.\n\n\nBTW, the Earth-Moon system is an oddball in itself, basically a binary planet with the gravity centre between earth and moon forming the planetary orbit around the sun.\n\n\nSize, or surface gravity, is the other criterium. There is no fixed value where a planet begins and planetoids end, but 1/10th of earth gravity could be a useful rule of thumb.\n\nSeveral of the larger moons (earth's, Titan and at least for of Jupiter's moons) would qualify as planets if they had their own solar orbits rather than orbiting a heavier planet. Most of the smaller moons are de facto asteroid/planetoids caught by the  planets.
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The easiest way to remember which way horizontal is, is that is goes in the same direction as the horizon
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use mnemonics to help remember lists of things
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Solar system is 11 letters in size.\n\nTHE solar system or A solar system are different matters\n\nWe have these things in English called defintite articles. Words like "A" and "THE". Learn them. Use them.