Exploring the Concept of 'Unknown' in Natural Sciences

Unknown is often used to describe something we do not know, understand, or have information about. In scientific contexts, this term can refer to various aspects of our understanding of nature. For instance, unknown species are those discovered by scientists which they don't yet fully know all their characteristics; unknown processes are events or interactions in nature that still need further study and explanation.

In astronomy, it refers to celestial objects whose distance, composition, temperature, etc., may not be known with certainty yet. Many stars and planets outside our Solar System remain largely mysterious due to their great distances from Earth, making observations and measurements difficult.

The human genome itself contains many 'unknown sequences,' genes whose function hasn't been identified as of now. Researchers continue working towards unlocking these mysteries so as to better comprehend how humans develop and behave.

Unknown also applies to fundamental particles — even though physicists spent decades pinning down what the basic building blocks of matter were, there exist numerous other types of particles predicted theoretically which haven't actually been found in experiments yet.

Lastly, when exploring new regions like deep oceans, or conducting geological surveys, one can encounter events, conditions, materials, beings, etc., that were previously unknown before such expeditions took place. Thus, 'unknown' is a key concept within several areas of natural sciences where we constantly push back frontiers of knowledge through observation and experimentation.