'For All Mankind' sneak peek: Tracy Stevens takes another small step on the moon in 'The Weight'

Data from Insight reveals size of Mars's core. Up until now, the only celestial bodies that have had their cores measured were Earth and the moon. To make such measurements, scientists have used seismic data - to date, sensors aboard the craft have captured seismic data for approximately 500 quakes.

Nasa completes test firing for rocket that could take astronauts back to the Moon

NASA Moon Rocket Passes Critical Engine Test