# When did we find out that a meteor killed the dinos?

**URL:** <https://boards.straightdope.com/t/when-did-we-find-out-that-a-meteor-killed-the-dinos/517871>\
**Category:** Factual Questions\
**Created:** [November 17, 2009, 3:01am UTC](https://boards.straightdope.com/t/when-did-we-find-out-that-a-meteor-killed-the-dinos/517871 "2009-11-17T03:01:22Z")\
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**Author:** ![Super\_Kapowzler](https://avatars.discourse-cdn.com/v4/letter/s/a698b9/32.png) [@Super\_Kapowzler](https://boards.straightdope.com/u/Super_Kapowzler)\
**Post date:** [November 18, 2009, 12:45am UTC](https://boards.straightdope.com/t/when-did-we-find-out-that-a-meteor-killed-the-dinos/517871/12 "2009-11-18T00:45:50Z")

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What is the consideration of a Quasar-effect/Gamma-burst/uber-Xray-event that could have happened, yet not coincided with an impact event? Wouldn’t a 1-day/rotation under an extreme radiation not be possible to cause catostrophic devastation? Do Cosmic/Gamma/X rays leave a telltale signature? Alpha/Beta exposure over time cause death?

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