Study Details Differences between Deep Interiors of Mars and Earth

An undated artist’s depiction of the Martian interior and the paths taken by seismic waves as they traveled through the planet’s core. (NASA/JPL and Nicholas Schmerr/Handout via Reuters)

Mars is Earth's next-door neighbor in the solar system - two rocky worlds with differences down to their very core, literally.

A new study based on seismic data obtained by NASA's robotic InSight lander is offering a fuller understanding of the Martian deep interior and fresh details about dissimilarities between Earth, the third planet from the sun, and Mars, the fourth.