How Low Can You Orbit?

I hear / read that we will loose the moon one day. Why? Maybe you could do a clip on that one day. And if it is true, why doesn't the sun loose some of it's planets. Thanks

i hate it when metaphysical aliens heal my living... it makes the dead jealous! About how to deal with aliens... not sure that we would need to do a lot. One thing about living in this universe is simply that we all live in it. and one thing about this tiny speck of a rock is that we are insanely well adapted to it, and any alien species would NOT be. They would likely require to keep their OWN atmosphere in a suit, as well as their own micro-biome and special needs. And though they could very well introduce some space alien microbe or bug that will eat our brains (or turn us into slaves to a single master telling all our secrets) it is just as likely (and far MORE likely) that our own microbes and bugs will kill them off first... basically because (yup! you guessed it) we have the advantage of evolution on our little rock in space with its atmosphere and nuances ! but then we get to technology and their ability to adapt. Unless they specifically have a biology (or self replicating technology/AI) that is capable of enhancing their evolution, adaptations or healing, biological defenses, microbiome etc, then it will likely end the same way... Especially considering we KNOW that certain microbes can re-grow flagella in as little as four days... and due to experimentalists like Lenski, Dr. Extavour, Dr, Whittaker and so many more, we also know that those pesky little buggers that keep adapting to everything around us from our antibiotics to our modern poisons can adapt, mutate and evolve pretty darn quick when they have pressures against them. our specialised evolved species (from micro- to macro- scopic) is a fine tuned adaptation to our planet. ...UNLESS !! ...unless they have armored space suits, the ability to kill of 100% of all contaminants (biological or chemical, etc) and metaphysical crystals that are healing the living