Massive supernovae explosions unleashed radioactive debris between 3.2 and 1.7 million years ago

Q.  Earth was showered with radioactive debris some 3.2 to 1.7 million years ago. This was due to:
- Published on 11 Apr 16

a. Formation of a new star
b. Supernova explosion
c. Galaxy explosion
d. None of the above

ANSWER: Supernova explosion
 
A series of massive supernovae explosions near our solar system have showered the earth with radioactive debris between 3.2 to 1.7 million years ago, according to a new study. Scientists have also found radioactive iron-60 in sediment and crust samples from the Pacific, Indian and Atlantic oceans.
  • Supernova refers to a massive explosion of a star as it runs out of fuel and collapses
  • Scientists hold that supernovae in this case were less than 300 light years away comparable to the brightness of the moon.

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