The best alternatives to 8Planets are NASA, Destiny 2, and Our SolAR. If these 3 options don't work for you, we've listed a few more alternatives below.
Our SolAR allows you to see our Solar System anywhere at all! All you do is tilt your device up and you see our whole solar system in your current setting, from your backyard to your bedroom, to wherever! It's never been more fun to learn about our Solar System!
Simply point your iPhone or iPad to the Sky and get to know more about every object you can see. Check 120 000 stars, 1200 satellites tracked in real-time, constellations, Messier and Caldwell deep space objects, all Solar system and several meteor showers.
Solar Idle is a free idle iOS game that players buy, build, upgrade, and colonize planets - including the sun. Not only is it an idle game, Solar Idle features a build in arcade where players can play various arcade games to increase earnings.