out of all the planets in other solar systems which are habitable?
827505
No other planets are habitable for humans.\n\nMercury and Venus being far too hot.\n\nJupiter, Saturn and Neptune for being gas giants and so has no solid surface. The gravitational pull of these planets would crush our bodies. Juipters gravititational pull is over 300 times the earth.\n\nPluto is too far away thus seeing temperatures of over -200 degrees C.\n\nMars would have been a perfect candidate, as the temperature is quite similar to earth's at occasion. But our lifes need plenty of water and the abundance of water on Mars is basically zero.\n\nFor other life than humans, a moon called Europa, which orbits Saturn, contains frozen methane and water, which could harbour life. The only problem is its a moon and not a planet.\n\nThere are all the other planets (approximately 250 so far discovered) in the Keiper Belt which need to be examined
33502
None, but there are nine planets in the solar system that Earth is part of.
94003
The earth is at an optimal distance from the sun, wherein it has the right temperature to foster life. Unlike other planets, it is neither too hot nor too cold. This way, it is the only planet in the solar system that has life. Therefore, the earth is unique. Hope that answers your question. Happy asking!
839196
It is more likely than not that there are many planets in the universe with life and many of those may have "intelligent" life.\n\nWe have just only obtained the ability to detect planets in other solar systems and we can only detect very large ones. We do not have the ability to detect Earth like planets.\n\nWithin our own solar system, we have yet to find undisputable evidence of life on any of the planets we have activley searched for it. Many scientists are optimistic about finding microbial life forms within our solar system though. There are still pleanty of places on Mars, for example, that we simply haven't looked, and there are many moons in our solar system with the potential for supporting microbial, and even more complex life forms. Jupiter's moon Europa is a good candidate because it is covered by a sheet of ice and thought to have liquid water oceans underneath. Due to Jupiter's gravity constantly tugging on the planet, it is likely geologically active and thermal vents may exist in it's under ice oceans. Here on Earth, underwater thermal vents are teeming with life, even though no sun light reaches them.
186825
Yes there are nine in our solar system, and as someone else mentioned Pluto is not really meeting the requirements to be defined as a planet. But the problem is rewriting the history books which won't happen so they will leave it as a planet... a "historical planet".\n\nIf we are talking about all known planets we have discovered, there are many. Extra solar planets have been found around distant stars for several years now. Not actually seen but found by measuring that planets gravitational pull on it's star. Of course we can't get an accurate count of all planets in the universe but we can use the "Drake Equation" to get a good idea.\n\nThe Drake Equation is:\n\nN = N* fp ne fl fi fc fL\n\nN* represents the number of stars in the Milky Way Galaxy \nAnswer: Current estimates are 100 billion.\n \nfp is the fraction of stars that have planets around them \nAnswer: Current estimates range from 20% to 50%.\n\nForget about the rest of the equation because it doesn't apply (looking for intelligent life)\nKeep in mind this equation is for our galaxy. They estimate 100 billion Galaxy's in our Universe (not to mention other planets that exist in other dimensions that we have discovered as a result of trying to solve the "unified theory" of everything) so…\n\nYou do the math!!!
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!
35874
In our Solar System, there are eight official planets, nine if you count Pluto (whose status is being debated).  \n\nAs for the rest of the universe, it is difficult to say, but it is reasonable to assume that planet formation from leftover stellar material is relatively common.  Astronomers usually detect large gaseous planets (like Jupiter) by the slight wobble of the star's motion due to the gravity of the planet, so currently it is almost impossible to detect small planets.\n\nAs of November 2005, there were 164 confirmed extrasolar planets.
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.
403766
Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto
330974
Here is another site.\n\nhttp://www.snyderweb.com/planets/
206810
Afraid not.  The only planet in our solar system that has the temperature and atmosphere that will sustain life is good old Earth.
969053
More than a decade after the first planets beyond our solar system were found, astronomers have discovered about 200 of these "extrasolar planets," as they're called. Using a common-sense definition of potentially habitable planets, coupled with extensive computer simulations, scientists have calculated how many potentially habitable planets might be detected around other stars by the SIM PlanetQuest mission. ("SIM" stands for Space Interferometry Mission.) \n\nThe mission, scheduled for a launch in the next decade, will target planets with specific traits in common with Earth: a similar mass and an orbit in the "habitable zone," not too close and not too far from its parent star. With this mass and location, it's believed a planet could have liquid water on its surface and an atmosphere -- conditions considered necessary for life to gain a foothold. \n\nThe science team has shown that, in a survey of the best 120 candidate stars for hosting such planets, SIM PlanetQuest would have the sensitivity to find: \n\n-- Planets smaller than Earth around six stars \n\n-- Planets smaller than twice Earth's mass around 24 stars
10008
we are the only planet sustaining life for myriad reasons.  first there is the distance from the earth to the sun.  if you were to increase the distance by only a few hundred miles. the earth would be to cold to suport life.  same thing the other way if you decreased the DX (distance) the earth would be way too HOT.  not to mention the increase in solar radiation UV and otherwise. so at least in this solarsystem a habitable planet would have to be about the same distance away from the sun.  and they have sent deep space probes out to verify that there isnt another planet in syncronusrotation to earth on the other side of the sun.  \n\nthere are other reasons some to complicated to mention and the rest, well... sorry but i just couldnt be bothered right now to list. things like the speed of the rotation of the planets, atmospheric conditions, lack of atmosphere,  gravity effects. etc etc etc....\n\nbut the most important reason that there are no other planets capable of suporting life is because Thats the way GOD made things.  \n\nnow potential exists for man to make habitable environments on 1 or 2 of the other planets in the solar system (mars possably venus) but that wouldn't be the planet sustaining life there. it would be technology sustaining life there.
47604
Planets: Venus and Mars\n\nMoons: Titan, Europe
925419
well all the planets have moons exept mercury and venus  There are 240 known moons within the Solar system, including 162 orbiting the planets here is a link  u can find more info and the names on the moons\nhttp://en.wikipedia.org/wiki/Natural_satellite
679895
mercury, mars, venus, earth, jupiter, saturn, uranus, pluto and neptune.
879452
Our solar system contains a G type star (the Sun), 4 terrestrial (rocky) planets: Mercury, Venus, Earth and Mars. \n4 Gas Giants: Jupiter, Saturn, Uranus, and Neptune.\nSeveral hundred moons\nSeveral thousand asteroids, kuiper belt objects, dwarf planets, and comets.\nLots of gas and dust\nBelow are some good sites for kids to do research.