How much different would life be if Earth had two moons?
107555
*Wandering into this topic as well* Hope you dun mind oh Giggly one, but you do ask some very interesting questions...\n\nKK If this planet had two moons, mind you this is conjecture as a lot is still theory in the scientific community.\n\nTides would differ from the 12 hour pattern we currently have.\nThe influence of the Moon's gravity upon the Earth is the primary source of our ocean tides. Newton had found that the attractive force of an object is inversely proportional to the square of the distance between the objects. This is known as the inverse square law. The first to apply this law to the question of tides was the Marquis de Leplace (1749-1827). http://www.christa.org/moon.htm\nHow they differ would depend on the mass of each moon and where they were in orbit.  It could be anything from 6 hours from between high tides. (if the moons were on opposite sides of orbit and same general mass) or our tides might even be doubled in size (if the moons were in close proximity of each other). IE real and regular tidal waves, not tsunami's\nThis part is pretty much proven by scientific observations...\n\nWhat is not yet proven but is rather plausible is that most likely we would have less of an atmosphere to breath. The theory is as our atmosphere formed; gravity of the moon as it orbited cause some of the lighter gases to bleed off. More gravity, more loss of gasses...\n\nAnd lastly, but a simple observation (wolf like I know, but concider the source), wouldn't that be simply just beautiful?
422733
yes it would affect the earth because it would disrupt our tides and all of our weather would either become very extreme or nonexistent also we wouldn't have a moon for any one else to visit and then we wouldn't be able to go to anywhere but the earth .
442996
THe main issue with the Moon being the same size as the earth is that the moon would no longer be pulled in by the earth's gravitional pull. The planets would either settle into seperate orbits or collide and kill us all.\n\nThat aside, the size of Earth is one factor determing wether or not life is supportable. Other important factors are the tilt (has to be within 3 degrees if I remeber correcctly) and it's distance from the sun. \n\nI have heard of the theory of an 'anti-earth', a tehrotical earth on the oppsite side of our orbit with the same chactersitics as our planet and therefore capable of life. This might be starying into the realm oif sci-fi though
381469
I assume that the question is How many planets do not HAVE moons. If that is the case, then the answer is 2, Mercury and Venus. All of the other planets have at least one moon.
1090261
Ah, well, first of all, the moon hits hydrogen atoms in space, and thus slows down from its orbit aound the sun, and thus slowly moves off from its current orbit, and since the sun's Fg is larger than the Earth's, we can say bug off to Earth's Fg on the moon. \n\nOn the other hand, the slight changes in the moon's orbit around the sun does have some changes, like a slightly lower high tide. Still, it does not compare to 300 years of industrial revolution damage the humans has done.
639247
But it does!  We have two small moons too!
1150339
It'd depend more on what forced the moon out of it's typical orbit.  If something slowed the moon then the moon would gradually fall to earth be a relatively smooth landing  probably destroying a lot of disruption where it lands and over most of the planet not to mention throwing off the equal libream of our axis causing the to rotate and wobble in random patterns until balanced again.  If it was forced very quickly it could shatter the planet, the planet would most likely pull back together but you could kiss all life goodbye, except very resilient bacteria. Refer to Mimas a moon that orbits around Saturn, also referred to as the death star moon.  Hope I helped
229624
Planets and asteroids.\n\nAll the planets in the solar system have a natural satellite except Mercury and Venus. \n\nSeveral asteroids are doubles, which two similarly sized components - so they don't count. But there are cases of asteroids with much smaller companions. So you can call these asteroids with moons.\n\nComplete lists of double asteroids - which includes asteroids with little companions (asteroid moons) is here:\nhttp://hea.iki.rssi.ru/~denis/doublemp.html\nhttp://www.johnstonsarchive.net/astro/asteroidmoons.html
512600
I'd see a waning gibbous moon.\n\nOur sentiments play tricks on us to make us think the moon is rarer than it used to be.  But it's been revolving around the earth for a very long time.
26143
the earth will probably not exist in the same fashion as it does today.  a meteor will probably hit us and start the life cycle again in the next 200 mill or so.  Probably more water and less land so i figure more water based life will exist
501990
two big full moons (if youre not black)
443155
First off, the rotation around it's axis speeds up. \nThe faster the speed, the more "rugby like" a sphere apears . \nThe moon would be orbiting it in a more eleptical orbit\nIts own orbit perhaps would be altered and become more eliptical. A more eliptical orbit results in us getting out of the "life zone" thus ending life on the planet throughout the course of several years... \n\nhmm... HOWEVER, if it was a Vertical Rugby ball then its the total opposite, for it would be rotating around the two pointy sides rather than the flat ones.  Interesting, I'm going to start making models !
613963
How many moons does Saturn have? There you go- good question.
892847
I would say Europa and titan. Europa is unlike any other body in the solar system, it is not jupiters smallest moon rather the smallest of the galilean moons of jupiter with a diameter of 3100km. Its surface is among the brightest in the solar system, a consequence of sunlight reflecting off a relatively young icy crust. \n\nIts face is also among the smoothest, lacking the heavily cratered appearance characteristic of Callisto and Ganymede. Lines and cracks wrap the exterior. if you were to scale Europa down it would probably be a smooth as a billiard ball. Scientists believe that beneath Europa's icy surface lies a liquid ocean which has the possibility of harbouring life. Let me make myself clear, we're not talking about intelligent life, but rather life that could be very similar to what is found at the bottom of our oceans. \n\nEuropa has a very tenuous atmosphere which is mostly made up of oxygen. Unlike oxygen on Earth however, which is created as a byproduct of photosynthesis in plants, oxygen on Europa is likely to originate when charged particles from the Sun hit water molecules on Europa’s surface. The water molecules are broken into hydrogen and oxygen atoms, and sometimes recombine to form hydrogen and oxygen gas. This kind of environement would make it an ideal habitat for life and very interesting for exobiologists.\n\nTitan would also be extremely interesting to exobilogists.It is the only moon in our solar system with a very thick atmosphere and  like Earth's atmosphere, the atmosphere on Titan is mostly made up of nitrogen. Unlike Earth however it is inhospitable to life due to the lack of atmospheric oxygen and its extremely cold surface temperatures (-183 degrees Celsius) . \n\nAlong with nitrogen, Titan's atmosphere contains a significant amount of methane. The only thing missing for Titan is a little bit of heat. What we know for sure is that the sun is getting warmer by approximately 10% a year. What this means is that in the future, the sun will begin to warm the surface of Titan and therefore give it the possibility of giving birth to life. With the amount of methane in its atmosphere a fair amount of heat would become trapped as methane is a very powerful greenhouse gas.\n\nHope this has helped you out :)
678509
I would guess that it would slow down as some water is redistributed toward the equator.  This slowing would be imperceptable without the use of atomic clocks.  It would also be affected in another way.\nThe effect of the moon's gravity on the oceans is causing the rotation of the earth to slow.  Kind of a drag.  One day, the earth and moon will be in locked step, with the moon in the same place in the sky 24 hours a day.
709262
Don't forget that large bodies like the earth itself, and the sun, are themselves held together with gravity.\n\nProbably the first thing that we would notice is that the earth would immediately lose its atmosphere as it went flying off the planet into space, as would the oceans.  Everything on the surface of the planet would go flying off due to the centrifugal force of its spinning ... buildings would just rip off their foundations like cheese shaking off a cheese-puff.  Without an atmosphere, it's doubtful you and I would live more than 15 or 30 seconds.\n\nThe earth  would immediately break apart in a big cloud of hot liquid iron (the core of the earth) and all the stuff on the surface.\n\nThe moon would also disolve into a huge cloud of hot rocks and sand.\n\nThe sun would explode rather violently, as the pressure from the burning of the inner core would suddenly have no force counteracting it.  The same would be happening to every star and planet in the universe.  And galaxies themselves would fly apart (as they too are held together with gravity).\n\nAnd yes, what is left of the earth would fly away from what is left of the sun ... although it would be quickly overtaken by the exploding sun.\n\nBut, of course, it ain't gonna happen.  I'll bet everything I own on it.  :-)  \n\nThink of this as a great way to get back in with your girlfriend ... "Hey baby, if gravity were suddenly to disappear, we need to be holdin' each other really tight!"  (You take it from there).
519780
I think would would see all phases of the Earth if you was on the moon. Just opposite from the way it is on Earth.