" We don’t know that Venus had oceans, but there’s every reason to believe it did. "
- David Grinspoon

In simple terms, the statement suggests that scientists are uncertain whether Venus had oceans at some point in its history but strongly suspect that it did based on current evidence and theoretical models. This perspective reflects a common scientific approach where researchers propose hypotheses supported by indirect clues rather than direct observation.

The quote delves deeper into the complexities of planetary science and our understanding of other worlds within our solar system. It highlights the methodical process scientists use to piece together information about planets, often relying on analogies with Earth or theoretical scenarios when direct evidence is lacking. The statement underscores how scientific knowledge can evolve from a combination of indirect evidence, theoretical frameworks, and comparative studies between different celestial bodies. This approach not only aids in understanding Venus but also sets the stage for more detailed investigations into its past and potential habitability.

David Grinspoon, an American astrobiologist and planetary scientist, is well-known for his contributions to the study of Venus and other planets within our solar system. His work often explores the geological history and atmospheric conditions on these celestial bodies, contributing significantly to our understanding of their evolution over time.