Lígia F. Coelho

Lígia F Coelho

51 Pegasi b Fellow at Caltech

Planetary Sciences and Astrobiology

About me

I lead an interdisciplinary research program on biosignature detection and interpretation at Caltech.

By integrating planetary science with biology, I develop new frameworks for the study of exoplanet biosignatures that challenge existing paradigms in the field.
My approach combines fieldwork in extreme environments, laboratory experiments, and modeling to address one of humanity’s most profound questions: whether life exists beyond Earth.
My academic interests also extend to innovation in space engineering. I design experiments aimed at improving astronaut comfort and sustainability during spaceflight and, in 2025, I led the first study to test menstrual cups under spaceflight conditions.

My work has been recognized with prestigious awards, including a 51 Pegasi b Fellowship from the Heising-Simons Foundation. In 2022, I was the sole Portuguese recipient of the Fulbright-Schuman Fellowship for Scholars.

Microbiologist and bioengineer by training

A decade of experience in biology and biomedicine including cancer research, infections diagnosis and microbial ecology.

From the field into the model

I go directly to the field to collect microorganisms with biosignatures of interest. I measure the reflectance of life at the surface and create biologically-informed planetary models.

Exoplanets and icy moons!

I measure the reflectance of a diverse set of microorganisms and use this data to simulate the surface of exoplanets or as a parameter for modeling the surface of icy moons like Europa!