The NASA Astrobiology Program Research Scholarship Program offers research-related travel support for graduate students and postdoctoral fellows. Applicants are encouraged to use these resources to circulate among two or more research teams, however any travel that is critical for the applicant's research will be considered. Travelers must be formally affiliated with a U.S. institution. Requests are limited to $5,000.
For more information, see http://astrobiology.nasa.gov/nai/funding/nai-research-scholarships
Source: NAI Newsletter