2: What is life?

We only know life from Earth, which makes it difficult to define objectively. As scientists, we use what we know as a model, e.g. life on Earth. These readings help us understand what life is and how we classify it in the context of the evolution of life on Earth - with an understanding that it could be different elsewhere in the Universe.

Thumbnail: Several types of photosynthetic bacteria (Cyanobacteria) that grow in Antarctic lakes and form pinnacles.