science

This is my personal opinion and should not be considered as professional advice. For me, I think there are no Ghost, they are just demons who appear to be ghost. Satan and his demons are subtle and deceitful. They can transform themselves into anything like angel or ghost to deceive many. But ghost doesn't have power against God. Therefore, if you are a believer in the Lord Jesus Christ, the bible says that "greater is He that is in you than he that is in the world". It means, the Holy spirit that is in you is greater than satan who is in the world. Thank you!