Thought this was interesting, I am reading a great book " Into the Light" by John Lerma M.d. It is encounters that a hospice doctor has had with a number of his patients as they are nearing death. They rare all similar , justifying things that happened in your life resolving issues and finally acceptance. They all see much of the same things, angels who guide you through passing and help with the issues and the pain bright lights and visions of heavens beauty, One patient was a doctor some what jaded by all the suffering he had seen who refuse to believe what he was seeing and hearing was anything more the delusions brought on by meds or pain. They mans doctor John Lerma the author explained it in scientific terms using principals of physics." Energy can not be created or destroyed it only changes form" humans are highly electromagnetic beings one of the strongest self contained and intelligent forms of energy on the planet." His theory you or your spirit will never die only the body.
Second point ( sorry Ghost pertains to orbs) again physics 101 " If you let energy follow it natural flow, it will almost always form a sphere because of gravitational forces , concentrated balls of light.
It is an excellant book there is one case where a Nazi war criminal could not forgive himself for what he had done and the angels showed him the dark side he confronted every person he lead into the gas chambers and lived in hell for days all in the end to show him that not only could he forgive himself but they very people he put to death forgave him immediately all for a lesson learned a greater good.They people who haunt are literally the haunted who can not make peace with themselves. Sorry running on just thought I share the physics 101 parts, thought they were interesting.