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Many are rare - like iron-60. These particles hit our atmosphere and settle like a thin layer of dust over the planet.' Intriguingly, the iron-60 layer found by the German group did not come from a single supernova but appeared to come from a number of them. 'Different layers seem to have fallen at different times, but all around two million years ago,' said Benítez. v

Revelation 12
3. Then another sign appeared in heaven: an enormous red dragon with seven heads and ten horns and seven crowns on his heads.
4. His tail swept a third of the stars out of the sky and flung them to the earth. The dragon stood in front of the woman who was about to give birth, so that he might devour her child the moment it was born.
5. She gave birth to a son, a male child, who will rule all the nations with an iron scepter. And her child was snatched up to God and to his throne.
6. The woman fled into the desert to a place prepared for her by God, where she might be taken care of for 1,260 days.
7. And there was war in heaven. Michael and his angels fought against the dragon, and the dragon and his angels fought back.
8. But he was not strong enough, and they lost their place in heaven.
9. The great dragon was hurled down--that ancient serpent called the devil, or Satan, who leads the whole world astray. He was hurled to the earth, and his angels with him.