A candidate with a B.Sc. in biochemistry and two years of undergraduate physics is considering a PhD in astrophysics but is uncertain about their chances of admission. The discussion highlights that many PhD programs, particularly in Australia, typically require a strong honors degree in a relevant field, which may disadvantage candidates without a full physics degree. It is noted that while some programs may accept candidates from related disciplines, biochemistry is generally not considered closely aligned enough with astrophysics. The importance of finding a willing PhD supervisor is emphasized, as well as the competitive nature of the astrophysics community, where candidates with the appropriate prerequisites are likely to have an advantage. Recommendations include reaching out to specific universities, such as ANU, to inquire about admission requirements and exploring interdisciplinary fields like astrobiology or molecular astronomy that may better align with the candidate's background.