We often look up at the sky with curiosity– at the Moon, the stars, or the Sun– but the most extraordinary world is the one beneath our feet. Earth is not the largest planet in the solar system, nor ...

The completed flight assembly of the High Definition Earth Viewing unit before it was launched to the International Space Station in 2014. Disclaimer: AAAS and EurekAlert! are not responsible for the ...

That is simply a question of how you define “Earth“. Assuming that our planet came together gradually as dust and particles slowly agglomerated, at what point do we start calling a particular chunk ...