[Q&A+] Why Are There No Binary Planets?

BONUS QUESTION STARTS AT 15:22 Watch the video here (with no ads) or on YouTube: https://youtu.be/MhJFyC_vdtk Why are there no binary planets? Should you buy into dark energy and dark matter? What apps are best for stargazing? And in Q&A+, why don't NASA just bring put wipers on Mars solar panels? 00:00 Intro 00:25 [@EdSceptic-y2e] Why are there no binary planets? 02:39 [@andrewczski1969] Do you buy into dark matter? 08:46 [@alcalbg] Does total dark energy increase as space expands? 10:11 [@Noonyuh] What are your favorite apps or sites for real-time maps of the sky? 15:22 [@andrewczski1969] just couldn't send along swiffers, huh? 20:00 Final thoughts