How do they know the Guanlong wucaii was around 190 million years ago?
116378
Well I did some searching for Guanlong wucaii and I was not able to find anything about it on the internet. There is some chinese pottery named wucai that is from the Ming period, from about 1368-1642 CE. So I really have no idea what object it is you are referring to in your question. \n\nAnyway, carbon dating is not used dating objects as old as 190 million years. Carbon 14, a radioactive isotope of carbon, is not much good for dating things older than 60,000 years of age, because all the radioactive carbon will have decayed away if one looks at objects much older than that. However, there are dozens of radiometric dating techniques, some that are good for objects billions of years old (like potassium-argon dating, or uranium-lead dating).\n\nThere are many other techniques besides radioactive dating. One can count tree rings. One can count layers of ocean bottom mud. One can count rings of coral growth. One can look at the changes in the protein structure since a creature died (the handedness of the organic molecules changes with time). And there are many other techniques (see references). These methods can be cross-referenced against each other for checking and improving confidence, and reducing error bars.
826729
its been millions of years
846863
4.6 billion years old
904815
First off, there was no year zero, the years go straight from 1 BC to 1 AD.\n\nI'm not sure there was a whole lot of science going on in the "western" world at that time - you may want to investigate what was going on in China or other areas.
1123972
The length of the year was about the same. The day has gotten a bit longer, so there were around 400 days in a year around 200 million years ago. For fossils only 6.5 million years old, there wouldn't be much difference (perhaps a day or two per year).
1176345
the earth is about 4.5 billion years old
616435
It's all guess work.\n\nTime did not exist until flesh man was created.\n\nConsider some scientific estimates or guesses. Not all scientists are going to agree. The Universe or heavens 20 billion years old. The Earth 4.6 billion years old. The Moon 200 to 300 million years younger than the Earth. Dinosaur extinction 65 million years ago. The Ice Age 2.5 million years ago. Oldest evidence of flesh man 7000 to 14000 years old.
971982
Sorry, "Lucy" lived 3.2 million years ago, not 35,000 years ago.\n\nScientists have a pretty clear trail of the spread of humans "out of Africa."  The first signs of humans in North/South America came about 40,000 years ago.  In Australia, about 55,000 years ago.  They didn't all appear at the same time -- and this is clear from geologic, anthropologic, and biologic evidence.
112629
Very roughly 2 billion years ago.  But you should be aware of two points. \n\nThe first is that the date is a matter of considerable debate and it could easily be half a billion years either side of that.\n\nThe second is that the transition was extremely slow, starting with the addition of oxygen by inorganic processes and then taking a massive leap with the evolution of oxygen producing autotrophs.
610011
5,000,000,000 years, more or less
991106
AT\n\nTHE BRITANNICA STATES  THAT IT STARTED TN  \nIN CHINA MORE THAN  2000 YEARS AGO
1167352
Totally, completely, 100% incorrect information!  Where do you get this nonsense from?\n\nThe oldest observatory in the world was excavated in north China's Shanxi province, and is believed to be 4,100 years old, predating the formerly oldest known observatory from South America.\n\nWhat is well known is that the Arab world gave us our current number system, and the concept of zero.
328127
depend on which country, china has been civilised for a super long time than america, so you cant say the "true" mm/dd/yy, until you know where ya are
653069
The Earth is 4,570,000,000 years old, approximately; though many Creationists think it to be only 6000 "without proof otherwise" they are wrong: we have proven it using gravitational measurements of other planets, measurements of solar brightness over time, radioactive dating, continental drift, and many other factors. If you want to  force religion on people, don't do it in a SCIENCE forum! You will only cause heated debates and great offense from both sides.
1171023
Radiocarbon and luminescence dating methods were used
141215
i dont think anyone really knows for sure. probably like thousands of millions of years. unless it gets hit by a ginormus asteroid and explodes into teeny tiny peices!! lol
1023108
The fossil history is false. The scientists don't know what they are talking about. Radiometric dating is flawed. Everything is a lie except the Bible. I am trying out the other side of this argument. It's pretty weak I must say.