Topic: geophysics

Earth core structure illustrated with geological layers according to scale (Getty Images/NASA/johan63)

Earth's inner core slows down

Matthew Rozsa
This mosaic image of asteroid Bennu is composed of 12 PolyCam images collected on Dec. 2 by the OSIRIS-REx spacecraft from a range of 15 miles (24 km). (NASA/Goddard/University of Arizona)

NASA pays a visit to asteroid Bennu

Nicole Karlis
(<a href='http://www.shutterstock.com/pic.mhtml?id=82000267'>Lukiyanova Natalia / frenta</a> via <a href='http://www.shutterstock.com/'>Shutterstock</a>)

A possible pole reversal?

John Tarduno, Vincent Hare - The Conversation