what is the lifetime of  this planet earth?
369953
Read:http://pubs.usgs.gov/gip/geotime/age.html
541650
Very good question.  I went searching and came up with this:\n\nBTW, the person that answered 687 is correct for EARTH days, not MARS days.  It appears to be closer to 668.6 Martian days.
760649
10,000\n\nHalf life means that after 5,000 years, half the radiation is present. In another five thousand years years, only a quarter is left. In another 5,000 only an eighth is left, etc.
629421
Age of the "world," taking Earth as the "world"...scientists estimate about 4.54 billion years.  Estimate was confirmed by radiometric dating using rubidium (and other decay series).  Radiometric dating is something I study, so that's why I trust this estimate.
1113828
The sun will burn out in 4.5 - 5 billion years.  But our planet will die way before that because sun will start dying in 3 billion years... that is if we dont' kill each other waaaaaaay before that.
299010
Global warming and even nuclear bombs will not destroy the earth they will merely wipe us out along with all the other life on earth.\nIf you are talking about the planet then you will have to wait for either a random meteor to blast the planet to peices or prehaps a super nove in our region of space.\n\nIf neither of them occurs then we will have to wait 5 billion years for our star the sun to enter its next phase of life and become a red dwarf star at which point it is predicted it will probably grow to a size that will encompass and destroy the earth.
329537
5 billion years or so.\n\nhttp://www.enchantedlearning.com/subjects/astronomy/sun/sundeath.shtml
477262
No one knows, at it's current rate of energy useage, a few million years. Which planet would I choose? Can't, you & I are already dead, besides all planets in our solar system would be lifeless (no sun).
1028317
The Solar System is believed to be around 4.5 billion years old. Hence, ignoring any changes in the length of the year, the Earth has orbited the sun 4.5 billion times.
330895
Greetings,\n\n4.5 billion more years until it swells into a red giant and engulfs Earth.\n\n-matt
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.
1089748
no, but it would be very stupid to assume that Earth is the only planet that can sustain and contains life.  the universe is gigantic.  i don't think any human can truly grasp how vast the universe is.
512167
Earth has been doing okay for the last 4.5-billion years, and should go right on for at least another 4-billion or so. The thing to worry about is how much longer mankind can exist on Earth. We're doing some incredibly stupid things to it, and each other.
698399
we still have about 4 billion years to go on that\n\nhttp://en.wikipedia.org/wiki/Sun
372861
In around 4 to 5 Billion years when the Sun is swollen in its death throes before it collapses into star known as a white dwarf . In fact the whole Earth will be vapourised.\n\nIf you mean by your question when will it be destroyed environmentally, then that's upto the caretakers of this planet wether that is humans or some other species.\n\nOtherwise the Earth will always have an atmosphere of one kind or another until the Sun begins to die.\n\nJules
937075
I hope that in 5 billion years. We have somewhat evolved beyond this planet. Besides we won't have enough land or fossil fuels to last the next five hundred. I can hardly imagine five billion years from now.
62696
http://www.wonderquest.com/LifeSpan-MaxMin.htm