Earth dating systems
Short answer: because the meteorites formed together with the Earth and the rest of the Solar System.Long answer: The Earth formed together with the rest of the Solar System and its meteorites around 4.5 billion years ago.
By the mid- to late 1800s, geologists, physicists, and chemists were searching for ways to quantify the age of the Earth.In January of 2015, astronomers discovered a solar system with five Earth-sized planets dating back to the dawn of the Galaxy.Thanks to the NASA Kepler mission, the scientists observed a pale-yellow Sun-like star (Kepler-444) hosting five planets with sizes between Mercury and Venus that was formed 11.2 billion years ago, when the Universe was less than 20 per cent its current age.When meteorites fall on Earth and you pick them up, you are able to date the time of their formation.You say: You have to distinguish the time that the meteorites form and the time that they hit the Earth.Bishop James Ussher, a 17th-century Irish cleric, for example, calculated that creation occurred in 4004 B. There were many other such estimates, but they invariably resulted in an Earth only a few thousand years old.
By the late 18th century, some naturalists had begun to look closely at the ancient rocks of the Earth.
Though there are a few frequently cited inflection points in that history—recorded instances of particular books using one system or another—the things that happened in the middle, and how and when new systems of dating were adopted, remain uncertain. Some might also count based on what year of an emperor's reign it was.
Egyptians also used a variation on this system, counting years based on years of a king's rule (so, an event might be dated to the 5th year of someone's rule) and then keeping a list of those kings.
If we, I suppose, use uranium datation for rocks, it means fluctuations of the Earth stratums implies modifications that make this datation irrelevant? You just can't reach him to ask him for his [email protected] ...
We could use rock datation, but most of them are unreachable, am I right? Think that you are standing in front of a group of 2000 people and you want to know who is the oldest person in that crowd, but you can only ask the age of the 10 or so people standing right next to you. what Michael is eluding to is that you need a large enough sample, because radioactive dating basically uses a ratio of the amount of material that has decayed relative to the amount that has not decayed.
These oscillations lead to miniscule changes or pulses in its brightness which allow the researchers to measure its diameter, mass and age.