| Space is astronomically big. Just how big? But what do those figures actually mean in terms of us and what is familiar? Are there other planets like our earth in among all those galaxies? How do people find out this stuff in the first place? What is the chance of us getting way out there, or ever making contact with intelligent life with which we can communicate? What could be more exciting? This is a challenging unit fitting all of cosmology into a human perspective, with a bit of playful science fiction thrown in. |
