In our own galaxy alone there are about 100 billion stars; 20% to 50% have 1 to 5 planets; let's say 100 billion planets per galaxy.
At an estimated 100 billion galaxies in the observable universe, there are about 100 * 10^11 * 100 * 10^11 = 10^26 planets.
That's 100,000,000,000,000,000,000,000,000 planets
I think subtracting one (earth) is pointless...
2007-01-06 06:55:04
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answer #1
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answered by Anonymous
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There are a total of 7 planets in our solar system excluding Earth.
Mercury, Venus, Mars, Jupiter, Saturn, Uranus, and Neptune. Pluto has recently been "demoted" and is no longer officially a planet.
2007-01-06 13:16:43
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answer #2
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answered by K.K. 5
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There are 10 planets including earfth and excluding Pluto. There were 2 new planets discovered beyond Pluto and were given names (can't remember them). There is the Planet X that's being considered as its within our solar system somewhere.
2007-01-07 20:52:18
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answer #3
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answered by ZORRO 3
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According to the new general concensus, there are 7 planets in our solar system excluding Earth. Sorry Pluto was demoted.
2007-01-06 11:33:34
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answer #4
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answered by WAYNE W 1
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We only know of nine other planets in our solar system Excluding earth. although i think Eris is an extremely new planet.This idea is strengthened by the fact that Mayan and Inca maps show our solar system coming in> from outer space rather than using the sun
2007-01-06 12:57:50
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answer #5
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answered by tricky 1
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Excluding earth there are 8 planets...
1.Mercury
2.Venus
3.Mars
4.Jupiter
5.Saturn
6.Uranus
7.Neptune and 8.Pluto
2007-01-06 11:36:53
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answer #6
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answered by Nazia N 1
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Since Pluto was demoted, there are now seven other planets not counting Earth.
2007-01-06 11:36:00
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answer #7
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answered by Chug-a-Lug 7
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8. Mercury, Venus, Mars, Saturn, Uranus, Neptune, Xena.
2007-01-06 22:35:31
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answer #8
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answered by haziqikram 2
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if u r asking about our solar system there r total ten planets including earth.these r:
mercury
venus
earth
mars
jupiter
saturn
uranus
neptune
pluto(was at first excluded,but now it is considered as a planet)
eris(new planet)
2007-01-06 12:33:39
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answer #9
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answered by Anonymous
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There are seven - Mercury, Venus, Mars, Jupiter, Saturn, Uranus and Neptune.
2007-01-06 11:51:31
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answer #10
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answered by cL@iRe 2
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