1.7 billion Tyrannosaurus rexes walked the Earth before going extinct, new study estimates - Livescience.com
- 1.7 billion Tyrannosaurus rexes walked the Earth before going extinct, new study estimates Livescience.com
- No killer asteroid expected in the next 1,000 years, but small ones may pose a risk: Study HT Tech
- No killer asteroids heading our way for 1,000 years. Probably Metro.co.uk
- Earth is probably safe from a killer asteroid for 1,000 years MIT Technology Review
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