It was the start of a new life, but traces of his old, rebellious self remained.

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NASA's Kepler observatory is designed to explore strange new worlds, seek out new life and civilizations traces of exoplanets and has clocked up around two thousand unconfirmed sightings.

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The 176-page volume, which comprises a brief foreword, four chapters and an epilogue, traces Jesus' life up to the age of 12, when, according to the Gospels, he was presented by his parents in the Temple in Jerusalem, the Vatican said.

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Cesium-137 has a radioactive half-life of about 30 years, and traces of the isotope still persist from above-ground nuclear bomb tests in the 1950s and '60s.

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Moreover, the Curiosity rover, which is equipped with 11 scientific instruments to probe for conditions suitable for life, isn't designed to detect the signs of microbial activity or any traces of fossilized bacteria.

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