If you can’t get into a doctoral program after your bachelor’s degree,
you may have to pursue a master’s degree first. While at graduate school, never refuse to assist your instructors with any field work or research projects they are conducting.
It’s a wonderful experience, and it will also aid you when you start your own projects or seek for employment.
Another career option is to work as a research assistant in an observatory.
To achieve this kind of job, you’d need to finish a master’s degree. Some astronomers work for organizations like NASA, researching space travel and satellite communication..
A good further source of information on how to become an astronomer is the American Astronomical Society