But how well do you really know our planetary neighbor? This quiz of 15 questions will test your knowledge of Mars' size, surface and history, as well as scientists' attempts to study it. Remember to ...

While Resilience and Blue Ghost are in orbit and preparing to leave for the moon, another lunar lander — Intuitive Machines ' IM-2, or Athena — recently arrived at Cape Canaveral to loaded atop of a ...