Mars is about half Earth’s size and roughly a tenth its mass — not really the sort of planet you’d expect to leave ...

As an astronomer studying the universe beyond Earth, I’m fond of “outside the box” views almost by default. But one of my favorites is whenever a spacecraft takes a snapshot of our home world and the ...

The earth (and humanity) would be very different without our smaller red neighbor. In A Nutshell Computer simulations show ...

"Without Mars, Earth's orbit would be missing major climate cycles. What would humans and other animals even look like if ...

Thanks to Einstein’s relativity, time flows differently on Mars than on Earth. NIST scientists have now nailed down the difference, showing that Mars clocks tick slightly faster—and fluctuate over the ...