What would happen to the earth if all of the planets suddenly disappeared?
492585
In the absence of the other planets, we would be the meteorites and asteroids favourite whipping boy, in 95-96, Comet Shoemaker Levy was feared to be on a head on course with Earth, it slammed into Jupiter. Also, many religions would go haywire since there are religious beliefs associated with the observance of some planets. Space travel would also be difficult, the Voyagers and the Pioneers are now at the edge of the Solar System only because they were accelerated by the gravitational field of the outer planets.
727739
first of all we'd need a little over 8 minutes to notice it had disappeared, after it had disappeared.\n\nthen it would be night time for all\n\ntemperatures would start falling. And instead of rising again with the next sunrise, they would continue falling.  Pretty soon even hot regions would reach negative temperatures.  Which would take its toll on plants, animals, and human beings (just imagine huge shantytowns w/o any heating, millions of human beings).\n\nin the richer world, and where we have seasons, we'd turn on the heating and make do.  It would not be fun living in the dark all the time, but people North of the North Pole do it in the winter, and they survive.  And Canadians, Fins, are organised to take very cold temperatures for extented periods of time.\n\nStill, many major cities would quickly suffer huge numbers of deaths (for how long can you overheat enough buildings in, say, Paris, until you run out of fuel, or the temperature difference with the ouside is such that your buildings are not well insulated enough?)\n\nWith panick, despair, and permanent night, we'd obviously soon seen riots, looting, all those things.\n\nPretty soon most plant life would die off.  And as a result most animal life would die off also.\n\nGovernments would probably then work on plans to shelter a number of people underground (see Armageddon for examples of how to try to do it).\n\nOnce you'd have people in shelters, you could dig down further hoping to get some heat from the Earth's core.\n\nBut.\n\nBut after a while, with plant life having largely disappeared altogether, we'd face huge food shortages, starting from a few months after the disaster.\n\nEven rats, or insects, need to be fed something...\n\nSo I'm not sure that much of Mankind would be left alive after at best a couple years.  Of course you could pick a rather limited number of "Survivors", and park them in some large, comfortable shelter, with a lot of canned food, and they could last for some years.\n\nMaybe we'd find some plants that really don't need any light and we could grow them for food?\n\nIt would be tough, for sure.  Remember, in the short-lived (couple months) "nuclear winters" caused by all the dust being blown up in the atmosphere by meteorite impacts, on each of the 5 mass extinctions life on Earth has seen, anywhere between 75%, and 90%, of the species disappeared...
243214
Our coastlines would probably move inward. Estimates range all the way up to several hundred miles, though that's pretty extreme. Some of the more familiar islands, like Hawaii, Iceland, and Japan, might shrink significantly, or even disappear completely. World climates would change. Temperate zones would shrink, and there would probably be a period (possibly long) of some very stormy weather.
206676
The world would come together in panic ... "Where the &*^^ did the US go?"  Conspiracy theorys would abound.  Tensions would be high - no one would trust anyone else.  Did an experiment go wrong?  Did one country develope an incredible weapon?  Are the aliens finally attacking?  Did God decide simply to wipe them off the face of the earth?  Different groups would claim responsibility -- most of them groups no one has ever heard of.  And all over this great world, there would be office pools involving which country would disappear next.  (My money would be on Akrotiri - but really, if they disappeared, who'd notice?)
129944
Don't worry, this will never happen. The "gravity" of the earth is actually caused by attraction between two objects of significant mass.  Were the gravitational force of the earth to vanish, that would mean that the earth itself had vanished.  It would also mean that you would be in free-fall, expereincing what might appear to be weightlessness.  not that this would matter considering that you would be in the void of space and would be dead.
343251
Yes the earth would move but not that anyone would notice.\n\nEvery time you push off from the earth, the earth moves \nat a velocity equity to -your_velocity* your_mass/earth_mass.\n\n6 billion people would be less than 600  tons while the earth is about 5,972,000,000,000,000,000,000 tons
545695
I'd lay pretty good odds that the destruction of a planet in our solar system, and one not even that far from us relatively speaking, would have such catastrophic consequences on the Earth that we'd probably all be destroyed. That is one reason we might resist the otherwise obvious urge to blow up Mars.
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
617519
I worry more about mass extinction events like an asteroid impact or finding out that giant aliens have just been raising humanity as a food source to harvest en masse. Bird flu might do a job on us or some alien organism brought back by space exploration which our bodies are unable to manufacture antibodies. Maybe global nuclear conflict will leave the earth a smoking glow-in-the-dark beacon rotating and wobbling in the solar system. Excuse me I have to go find my aluminum foil hat to block the gamma rays. Wait what if planet Jupiter is a brown dwarf star and decides to go nova? What if the sun flames out? What if the magma in the earth's crust makes the poles flip positions? .........
1064119
If the sun were any farther from the earth we would all freeze to death. If it were any closer, we would all burn to death.
59568
The earth spins at about 1100 miles per hour at the equator (26,000 miles in 24 hrs) so stopping fast would be very distasterous to all living things. Remember, everything not locked down on earth would try to keep going 1100 mph! Imagine the ocean water going 1100 mph & slamming all the coastlines! From a human perspective, it would be very exciting for a second or two, then we'd all be flying with debris all around us that suddenly is going 1100 mph. I'd imagine lots of trees & rocks & bricks & wood & cars & metal, it would not be fun... Eventually we'd land on the ground or hit a mountain or something that stopped along with the earth. We'd then go up to heaven or nirvana or whatever religion place we go when we die. I would think things like seeds, bacteria & bugs would survive - but I'm only guessing given the way all the weather, land & seas would be changed. I doubt gravity would change very much but nobody would be alive to check...
902513
"According to astronomers, the Earth should last for at least five billion more years before the sun becomes a red giant. Due to the sun's loss of mass the Earth would escape to an orbit at a further distance than its current orbit. The immense heat however would likely boil off the oceans and turn the Earth into a barren wasteland looking like Mars does. If the Earth survived this event, the sun would further evolve into a white dwarf and provide too little heat to sustain life."\n\nNormally I don't copy and paste but Wikipedia explained that a lot better than I could've. I guess the "five billion years" estimate is assuming that some other catastrophe doesn't happen in the meantime, like an asteroid impact or human-created disaster or anything like that. But if none of that happens, Earth will be here for a while yet.
1046831
The worst thing that'll hurt the Earth is getting melted by the Sun when it grows from a small yellow star into a red giant star in about seven billion years, as estimated by astrophysical calculations.\n\nThe Sun will  transform all the hydrogen it has into helium by fusion of hydrogen nuclei into helium nuclei. The helium will accumulate in the Sun's nucleus, and the Sun's volume will increase. Its temperature will also increase. As a consequence, In about three billion years, water in the Earth's oceans will evaporate. In about seven billion years, the Sun will ultimately swallow Mercury, and its temperature will be so high that the Earth's rocks will melt.\n\nAfter that, the Sun will have burned all the helium in it and shrink into a white dwarf star, so the Solar System, including the Earth, will freeze.\n\nThat will mark the end of the Earth, and so it will be the thing that will hurt it most.
800747
Sounds good to me except for #8. Without sufficient mass, the planet would lose it's atmosphere. There sure are a lot of jokers around here, have you noticed.
368466
it would disappear... (as per the the current physiscs theory we have..)  it would go to the future :)
68589
One consequence would be wherever the earth stopped the side with the sun on it would fry and the side without the sun would freeze.  Gravity would be disoriented so the tide wouldn't go in and out as usual.  The list goes on...
661513
The earth came into existence by some as yet undetermined process, the most likely of which was a "big bang" whereby all existing planets and solar systems began to form into their current transitory states. During that process, animal life began to form on the earth, by yet another unknown process. The earth is currently in a state of transition that will eventually result in its return to the previous unknown condition that resulted in the "big bang."\n\n\n\nNow send me $5 or I'll put a curse on you.