How long will the earth last for?
401201
Really depends on your definition.  As this is the Astronomy section, I assume you mean in that basis :)\n\nIn roughly 5 billion years, the Sun will run out of Hydrogen in it's core.  As the size of the un is a careful balance between it's Gravitational contraction, and the internal pressure from Nuclear Fusion in the core, the size will go through a series of short (relatively anyway) changes, resulting in a Red Giant.\n\nUsual calculations place the Earth just outside the new surface of the Sun (though some put it inside the sun).  This will scorch the planet of all life, air and water.\n\nAssuming this isn't enough for you, eventually (after a long long time) the sun will contract again  and become a White Dwarf.  This will slowly cool and become a Brown Dwarf, and then Black Dwarf.  The Earth will be a cold, dark, silent lump of rock in the middle of empty space.\n\nHow cheery :)
623808
Nature will take care of that problem. Once the Earth's resources are depleted and human population starts to wane then economies will crumble (a healthy economy is built around a growing population), famine and disease will be rampant. At least 80% of the human population will perish.\n\nNow aren't you glad you asked.
54811
According to the US Geological Survey (USGS), the Earth is approximately 4.5 billion years old.\n\nThe articles below discuss the evidence for this estimate.
840496
Scientists say that in 5,000,000,000 years, the sun will suddenly expand, probably all the way to Earth's orbit.  Even if it doesn't come this far, we will be fried. Before then, humanity may end, but Earth will still be here.
66159
The generally accepted age for the Earth and the rest of the solar system is about 4.55 billion years. I am not an expert on this matter, but I believe in science. If someday people find new convincing theories, I will be very open to accept them. But only 6000 years old? Come on, I don't buy it.
1033355
Yes but it will be a long time away. In 6 to 7 billion years, stellar evolution theory predicts our sun will evolve into a red giant  and will probably completely surround the Earth. I don't think I will be around then.
976309
not millions of years, as the previous answers say.  try about five billion years from now.  at that time, the sun will have used up its supply of hydrogen fuel.  it will try to burn off the helium that now fills its core, and expend so much energy in the process that its outer layers will expand beyond the orbits of mercury and venus, and making earth's surface semi-molten (if it doesn't destroy the planet).  it will thus become a red giant.  as it slowly cools and fades, it will shrink to become a white dwarf, and finally die out as a black dwarf.  hopefully before then, we'll have long since been gone, if we haven't destroyed each other by then.
351366
The earth is continuously bombarded by small cosmic dust particles, ranging in sizes. The bigger onces millimeter size and bigger burn up in the atmosphere of the earth leaving visible traces that may last seconds or longer.
336535
Total life span=8billon+yrs.\nIt may last for another 4.5 billion years.....(and counting)
406243
very long. this is because the sun is a very large star and will take billions or rather trillions of years. when it does burn out however, it will be big enough to swell so big that it will swallow mercury, venus and possibly earth ^^ good luck
1076079
The sun will grow until it engulfs the Earth before it burns out.  And long before that, the temperature will get way too hot and evaporate all the water, and the planet will no longer be able to support life.
750691
The Earth will probably not be destroyed. All life may die but the Earth will still be here. Something about 300 meters across hits the Earth about once every 20,000 - 30,000 years. This is big enough to make a city sized crater.\n\nHere is a link to the Top 10 Ways to Destroy the Earth. \nhttp://www.livescience.com/technology/destroy_earth_mp.html\n\nTo blow up the Earth you would need 224,000,000,000,000,000,000,000,000,000,000 Joules. The Sun takes nearly a WEEK to output that much \nenergy.
571568
oil is not a sustainable resource, so it will not last forever. \n\nSustainable resources, like sustainable agriculture, and sustainable development is  a way that we can configure human development a society in such a way that it does not compromise the need of future inhabitants of earth, this includes not just your children, by your childrens children and so on. I have included a link on sustainability it is packed with information and tons of resources to learn more about why it's essential to our existence. People are getting together everyday in this country (and with other countries) and around the world to create and improve sustainability.
1176345
the earth is about 4.5 billion years old
303640
for sure when the Sun expands and dies. but that's not for a few billion years.  no worries.
813348
No one is really sure yet. Astronomers and meteorologists are working everyday to figure out what is going to happen but the only theory is that....\n1- The earth stops rotations and can cause us to die\n2- The earth can get compressed into a small cubical.\n3- Nothing at all and we still live... which i hope is this.
805940
The people who said it is closer to 4.5 to 5 *billion* years, are correct.\n\nThe sun is a class G star, which has a lifespan of about 10 billion years (the main part of it's lifespan ... after 10 billion years, it expands and goes through a second, larger but shorter-lived phase).  The sun is about 4.5  to 5 billion years old, which means that it's about halfway through its main lifespan.   So it will be here a little bit more than it has been here already ... which is a *very* long time.\n\nIf the earth hasn't been physically destroyed by an asteroid, or some man-made catastrophe we cannot imagine yet, I am quite sure that life will still be going strong on the earth at that time .. but that humans will be long gone.   Either we will have left after making the planet uninhabitable for ourselves, or we will have killed each other off, or we will go extinct through natural causes (like an asteroid that doesn't destroy the planet, but does wipe out most life).  But in all cases, some life forms will survive, and will do quite fine without us.\n\nEven if we blew each other to pieces with nuclear weapons, and wiped out almost all life on the planet due to radiation, some life would survive the radiation (e.g. in the deep oceans) and life would eventually bounce back ... and would begin the process of evolution all over again.  That's what life does.