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A cosmic microwave signal which is about 15 billion years old, means just from beginning of universe.1978 Nobel Prize in Physics: Cosmic Microwave Background With their discovery of the cosmic microwave background in 1964, Arno Penzias and Robert Wilson set the seal of approval on the Big Bang Theory, and shared the 1978 Nobel Prize in Physics for their discovery.

The presence of cosmic microwave background is considered by scientists to be proof that the universe was born at a definite moment, some 15 billion years ago.

These radioactive elements constitute independent clocks that allow geologists to determine the age of the rocks in which they occur.

The radioactive parent elements used to date rocks and minerals are: Radiometric dating using the naturally-occurring radioactive elements is simple in concept even though technically complex.

By 1907 study of the decay products of uranium (lead and intermediate radioactive elements that decay to lead) demonstrated to B. Boltwood that the lead/uranium ratio in uranium minerals increased with geologic age and might provide a geological dating tool.

As radioactive Parent atoms decay to stable daughter atoms (as uranium decays to lead) each disintegration results in one more atom of the daughter than was initially present and one less atom of the parent.

As a result, rocks that record its earliest history have not been found and probably no longer exist.

Nevertheless, there is substantial evidence that the Earth and the other bodies of the Solar System are 4.5-4.6 billion years old, and that the Milky Way Galaxy and the Universe are older still.

Wear on the garment indicates that it was likely used before it was buried.

They were working with a sensitive radio antenna at Bell Labs’ Crawford Hill Laboratory outside Holmdel, New Jersey when they discovered a persistent hiss with no obvious explanation.

It came from all directions and, in spite of repeated checks for sources of noise, it refused to go away.

The principal evidence for the antiquity of Earth and its cosmic surroundings is: Spontaneous breakdown or decay of atomic nuclei, termed radioactive decay, is the basis for all radiometric dating methods.

Radioactivity was discovered in 1896 by French physicist Henri Becquerel.