2.5 billion years,3.8billionyears,4.6billionyears.
2007-09-21 14:52:12 · 13 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space
I agree with lindajune (and others, 4.54 billion) as the Earth formed after the Sun though they are formed of the same coalescing cloud of material because the Sun and the entire solar system essentially form at nearly the same time.
However most radioactive dating measurements of the Earth begin after the material cooled enough to establish a consistent radioactive half life signature.
2007-09-21 15:16:25 · answer #1 · answered by Lazarus 3 · 3⤊ 0⤋
According to the Bible it's 6000 years, but with facts and evidence it is predicted to be 4.6 billion years old. We just know that it's older than 3 billion years old because scientists found a rock that was older than 3 billion years old.
2007-09-21 22:36:52 · answer #2 · answered by Mythical Tales 6 · 1⤊ 0⤋
Scientific evidence indicates that the planet formed 4.54 billion years ago.
Studies of meteors and cometary debris indicate that 4.6 billion years ago the Solar System formed from the gravitational collapse of a giant molecular cloud. Earth formed in the millenia after that.
2007-09-21 22:03:23 · answer #3 · answered by Anonymous · 4⤊ 0⤋
4.6 Billion Years.
2007-09-21 22:40:30 · answer #4 · answered by Anonymous · 2⤊ 0⤋
The oldest substance found on Earth comes from the Jack Hills of Western Australia. The area is among the oldest exposed terrain on the planet with surface rocks 3 billion and more years old. Within one of these rocks zircon crystals have been found which are even older, dated at 4.404 billion years +/- 8 million years.
I have held one of these rocks in my hot little hand at Geoscience Australia several months ago.
Here is possibly the original paper by the Western Australian geologists who found it.
http://www.geology.wisc.edu/%7Evalley/zircons/Wilde2001Nature.pdf
and another
http://www.fhsu.edu/biology/eastrauss/Courses/MicrobEcol/Papers/Nisbet%20and%20Fowler%202003.pdf
Moon rocks returned by a Soviet Union unmanned probe and by Apollo astronauts show ages consistent with this and with meteorites picked up here and there around Earth.
2007-09-22 02:12:56 · answer #5 · answered by Anonymous · 0⤊ 1⤋
The closest of the choices you list is 4.6-billion years, although most geologists say 4.5-billion years.
2007-09-21 22:01:35 · answer #6 · answered by Chug-a-Lug 7 · 3⤊ 0⤋
almost 5 billion years
2007-09-24 10:02:26 · answer #7 · answered by Anonymous · 0⤊ 1⤋
According to the last research I read it is supposed to be about 4.5 billion years old.
2007-09-21 22:01:26 · answer #8 · answered by Anonymous · 3⤊ 0⤋
4.6 billion years. Just think of a birthday cake for the earth with one candle for each year!!!
2007-09-21 21:56:06 · answer #9 · answered by cattbarf 7 · 5⤊ 0⤋
The generally accepted number is about 4.5 billion years.
Doug
2007-09-21 21:59:22 · answer #10 · answered by doug_donaghue 7 · 4⤊ 0⤋