The age of rocks is usually determined by radioactive (or radiometric) dating. Some elements are radioactive and gradually convert from one isotope to another. For example, uranium 238 (238U) will gradually convert to lead (206Pb). It will do this at a constant rate. The rate is described as a half-life of the isotope in question. This is the period of time it takes for half the atoms of 238U to convert to lead. For this particular element, the half-life is 4.47 billion years and uranium/lead dating is useful for rocks between 1 million and 4.5 billion years (as luck would have it!). Other elements are also used (potassium/argon for example). The choice of element depends on how widespread it is - if it isn't found in many rocks then it's not very useful. And how long the half-life is - if the half life is shorter than the age of most rocks then its equally unuseful. Radiometric dating can only be performed on igneous rocks. The uranium/lead elements are most often used because igneous rocks often contain uranium and the half life is so long. The oldest rock found is around 4.54 billion years old. This is consistent with the age of rocks from the moon and from meteorites, which all point to an age around 4.54-4.56 billion years. Separate studies of the sun's mass and luminosity suggest that the solar system itself can't be much older than these rocks. All of this is well-known scientific information. The arguments against it lack scientific credibility, and most of them are posted by so-called Young Earth Christians. The vast majority of the scientific community accepts as valid the information provided by radiometric dating. The claims made about "assumptions" in radiometric dating of billion-year old rock are actually stepping stones that those who work in the field have worked hard to eliminate as impediments to the accuracy of their measurements. Making a "claim" about any aspect of radiometric dating without scientific proof that something is wrong, as has been done, does not invalidate the work - or the mearurements. The earth is about four and a half billion years old.
The age of the Earth is around 4.54 billion years (4.54 × 109 years ± 1%). This age has been determined by radiometric age dating of meteorite material and is consistent with the ages of the oldest-known terrestrial and lunar samples. The Sun, in comparison, is about 4.57 billion years old, about 30 million years older.
Our galaxy, the Milky Way, appears to be one of the oldest galaxies in the cosmos - engineering itself around 11-13billion years ago.
Our solar system was built from the remnants of a giant star's death - a supernova. Most of the remaining hydrogen was pulled back together after the explosion, which helped create our sun. When our sun came into life, it sent a shockwave of solar wind through our "neighborhood" which blasted the remaining materials from the dead star out into space and those materials are what gave rise to Earth and the rest of the planets we see in our solar system. That's why the rockier planets are closest to the sun and the gas giants are at the edge of the solar system - the blastwave sent the lighter materials further out than the heavier ones like carbon, oxygen, iron, etc.
A little history of the study of the age of the earth may help in understanding how geologists came to this answer.
The details are quite complicated, but as I understand it, the main evidence is radioactive decay. The exact mix of isotopes of different elements in a compound can provide evidence of how old it is (sometimes this might mean, when a substance solidified), since the mix of isotopes will change over time, in case some of the isotopes are radioactive.
The best estimate for Earth's age is based on radiometric dating of fragments from the Canyon Diablo iron meteorite.
RadioActive Dating Moon Rocks
2 Billion years
the biosphere reaches from the floor of the ocean to the tops of the highest mountains. all together,the biosphere is a layer blanketing the earth about 20km(12.4m) thick
3.5 billion years ago
It depends on the conditions. Scientists have previously discovered ways of creating fake diamonds by using a highly pressurized cooking chamber. However, natural diamonds that form under Earth's crust can be anywhere from under 1 billion years to more than 3.3 billion years.
It's really just four and a half billion years old according to the most recent measurements by geologists. The entire universe is about 13.7 Billion years old.
No. Scientists estimate that Earth is about 4.6 billion years old.
It was actually the Earth that was shaped in its orbit in the sun. Scientists estimate it was 4.5 billion years ago when the Earth was formed.
4.94 to the 10 power easy shi*
4.6 billion years
3 billion years.
Scientists estimate the age of our Solar System to be around 4.7 billion years old. They base this on observations and light spectrometry of the Sun.
scientists believe it.
6.5 Billion years ago.
About 4.5 billion years.
4.6 billion years old
The current best estimate for the age of the Earth is 4.567 billion years old.
No. The current best estimate is about 4.6 billion years.