Age of the Earth - Wikipedia, the free encyclopedia
Today's accepted age of Earth of 4.55 billion years was determined by C.C. Patterson using uranium-lead isotope dating (specifically lead-lead dating) on several meteorites including the Canyon Diablo meteorite and published in 1956.Yeah because we can't narrow the age of the earth down to the last second we don't know for sure when it was formed. The God of the Gaps rears it's ugly head again.Some meteorites are furthermore considered to represent the primitive material from which the accreting solar disk was formed. Some have behaved as closed systems (for some isotopic systems) soon after the solar disk and the planets formed. To date, these assumptions are supported by much scientific observation and repeated isotopic dates, and it is certainly a more robust hypothesis than that which assumes a terrestrial rock has retained its original composition.
Nevertheless, ancient Archaean lead ores of galena have been used to date the formation of Earth as these represent the earliest formed lead-only minerals on the planet and record the earliest homogeneous lead-lead isotope systems on the planet. These have returned age dates of 4.54 billion years with a precision of as little as 1% margin for error.:310–341
Definition of assumption :
assumption - definition of assumption by the Free Online Dictionary, Thesaurus and Encyclopedia.
At this point in the life of science. There is little left to 'assume' in the scientific world. If it is not based on data. You have nothing.1. The act of taking to or upon oneself: assumption of an obligation.
2. The act of taking possession or asserting a claim: assumption of command.
3. The act of taking for granted: assumption of a false theory.
4. Something taken for granted or accepted as true without proof; a supposition: a valid assumption.
5. Presumption; arrogance.
6. Logic A minor premise.