For instance, if you were studying weather patterns on Mars, you'd be studying exometeorology. An exogeologist astronaut might study layers of rock on Titan. Exo-oceanography might be required if there turns out to be an ocean under the ice crust of Europa. An exobiologist is concerned with all aspects of biology not on Earth.
Exobiology is frequently misunderstood.
Of course, we can also deal with more hypothetical questions, such as alien life forms. But here, exoscience is not a simple guessing game. Based on what we know about evolution, biology, and chemistry, we might be able to make some fairly reasonable guesses about what forms of life might evolve in different situations. Specifically, this branch of exobiology is usually termed xenobiology . For a further discussion of this, please see the Alien Studies Page.