Can someone explain the investment thesis behind space stocks?

Hey all, First time posting, I have done quite well over the last year jumping on GOOG, AMD, ARM and NVIDIA, and I have pivoted more into MU, DRAM and SNDK. I have seen lots of space stocks blow up which I partly think is due to the upcoming SPACEX IPO. However, I really don't understand why companies like ASTS, RKLB, and LUNR have been blowing up so much -they aren't hugely profitable companies. They don't have insane revenues like AMD or MU to back up their share prices. Can someone explain to me please why they are so popular, other than hype? Also, are we close to their peak, or is there still lots of room to grow on these stocks. I am fully expecting SPACEX IPO to drastically drop after about a month as I cannot see the justification behind these crazy valuations. Thanks for your help! Sincerely, a guy who just wants to understand and who is thinking offloading his laggards (MSFT and META).