what are the diffrent types of planets ?
101041
There are two main types of planets: the rocky planets (Mercury, Venus, Earth, Mars) and the gas giants (Jupiter, Saturn, Neptune, Uranus).  Rocky planets are also called terrestrial planets, and gas giants are also known as Jovians.  Pluto is sometimes classified as an icy planet, although its status as a planet (or a lost comet/moon) is disputed.
1118239
So many questions.  I'll go with what I know:\nthe universe is expanding\nstars generate energy from fusion of Hydrogen, except later in life when it's heavier elements.\nstars' death depends on the mass\nstars end life as :nova, supernova, black hole, so they must begin life as a nebula\nmassive stars become black holes or ... neutron stars/pulsars? I think\n4 terrestrial planets:\nMercury, Venus, Earth, Mars.  Earth and Mars have natual satellites.  Mercury is the smallest.  Between the inner planets & outer planets is an asteroid belt.\nThe outer planets are Jupiter, Saturn, Uranus, Neptune and Pluto.  Sometimes the path of Pluto makes it closer to the sun than Neptune.  Otherwise, I've listed them in order outward from the sun.
1075964
They are called extrasolar planets, and there is great info about them at the following sites\n\nhttp://www.nineplanets.org/other.html\nhttp://curious.astro.cornell.edu/extrasolarplanets.php\nhttp://en.wikipedia.org/wiki/Extrasolar_planets\n\nFor a definitive list, try this site\nhttp://en.wikipedia.org/wiki/List_of_stars_with_confirmed_extrasolar_planets\n\n55 Cancri is an interesting one, as many feel it has similar characteristics to earth\n\nhttp://curious.astro.cornell.edu/question.php?number=135\n\nHope that helps!
933495
Binary systems can and do have planets orbiting (25% of all known extra solar planetary systems are around binary or multiple star systems). Some systems in which the stars are close to eachither have the planets orbiting both stars, some systems have planets orbiting only one star in the system. Many planets in binary systems have highly eccentric orbits (like comets), are widley seperated from the star (600-2500 AU, the habitable zone around solar type stars is 3 AU). \nHabitability depends on so many things that it's really hard to say for sure if any exist but it is certainly possible.
100436
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
1039550
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto.  Sometimes...Uranus, Pluto, Neptune.  Pluto has an unusual orbit.  Sometimes it crosses Neptune's path, making it closer to the sun than Neptune.
232112
planets, stars, and quasars
915328
By your criteria, Mercury, Venus, Mars, Saturn, Jupiter, Neptune, and Uranus are not planets.\n\nMercury has no atmosphere and therefore no weather or vegetation.\nVenus has no vegetation.  It's 900 degrees on the surface!\nMars has no vegetation, no liquid, and no magnetic field.\nSaturn & Jupiter are gas giants and have no vegetation.\nNeptune and Uranus are mostly gas and do not have vegetation.\n\nThus, by your criteria, Earth is the only planet.\n\nI did not consider "internal plumbing" because the term is too vague.
533962
The link below has great overview info and statistics (including density) for all the planets, asteroids, comets, etc. \n\nCheck it out!
633673
Here are some quick facts:\n\nhttp://www.sir-ray.com/ Enter the site, click astronomy then click on Space Dimensions & Planetary Facts (this site is excellent)\nhttp://www.dustbunny.com/afk/planets/\nhttp://www.kidzone.ws/planets/index.htm\nhttp://nssdc.gsfc.nasa.gov/planetary/planetfact.html\n\nThese sites should be everything that you need~the first site should do it but the other three have little bits of information that might be useful~
11810
The 10th planet.\nhttp://science.nasa.gov/headlines/y2005/29jul_planetx.htm
188214
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto....learned them in 4th grade. Kind of sticks with ya'.
47604
Planets: Venus and Mars\n\nMoons: Titan, Europe
285028
Go to Heavens Above.  They have a lot of information about the planets, as well as satellites that have been placed in orbit or sent out into the solar system.\n\nhttp://www.heavens-above.com
584504
10 is my answer. A new planet call UB313 was discovered. Here are they planets in order:\nMecury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto.\n\n10 Planets said. 10 Points for the best answer
220183
Simple way to look at this perinnial question. One solar system. One planet like earth froms. Sustains life. Universe is filled with billions of stars. Some the size of our Sun. Some have planets revolving round them. Like earth too. Take a wild guess and u wont be wrong. \n;-)
537406
in our solar system: 9\n\neven though larger bodies exist in our solar system, we're too used to having 9 planets to ever change.