What best characterizes the relationship between life science and astronomy in studying life in the universe?

• A. They are entirely separate.
• B. They are interdependent and influenced by one another.
• C. Astronomy alone suffices.
• D. Biology alone suffices.

Answer: (B)

Studying life in the universe relies on a two-way collaboration between how life works and how the cosmos is structured. Astronomy shows where life could exist—from distant exoplanets in habitable zones to the atmospheres and radiation environments those worlds have—providing the data about space conditions, distances, and planetary systems. Biology explains what life needs, how it builds its chemistry, and what signs we would expect to see if life is present, including the kinds of biosignatures that might be detectable. Because of this interplay, astronomical observations guide the search for potentially habitable environments and tell us what to look for, while biological understanding tells us how to interpret signals and assess plausibility of life in those environments. Neither field alone is sufficient: astronomy can identify targets but not confirm life without biological context, and biology can describe life in principle but needs astronomical data to know where to look and under what conditions life could persist.