... Research Opportunities . ... Hubble Fellowships . ... The research will be carried out at United States Host Institutions chosen by each Fellow. ... It is essential that candidates for Hubble Fellowships give serious consideration to their designations of first, second, and third-choice Host Institutions before their applications are submitted. ... Applicants who have been awarded a Hubble Fellowship must arrange for their Fellowship to be endorsed by an official of the Host Institution. ...