- NASA scientist warns Earth is due for an extinction-level event https://www.airsassociation.org/services-new/airs-knowledge-network-n/airs-articles/item/17325-nasa-scientist-warns-earth-is-due-for-an-extinction-level-event 42 comments worldnews
- NASA scientist warns Earth is due for 'extinction-level' event http://www.foxnews.com/science/2016/12/14/nasa-scientist-warns-earth-is-due-for-extinction-level-event.html 31 comments worldnews
- NASA Scientist Says Earth Is Due for ‘Extinction-Level’ Event http://nymag.com/daily/intelligencer/2016/12/nasa-scientist-earth-is-due-for-extinction-level-event.html 16 comments space