Yes, they can. this falls into the same category as some stranger taking your picture while you are out in public. No one owns the sky, it is considered public, just like a public street. Pictures can be taken from a public place of an object where no right to privacy is expected. You are not expected to have a right of privacy outside your house. Inside yes, in a public restroom/dressing room - yes.
Do more research on the law as it relates to photography and privacy.
