Although it might seem more like biology, the search for life out there begins with physical science. Your second topic option is to write a paper about searching for life in our galaxy. The paper should include:
Scientific arguments from peer-reviewed sources favoring the possibility of life
Counterpoints from those who think it is unlikely based on their own scientific hypotheses
The methods used in this search
What we are looking for
The differences between life and intelligent life
How life might exist in non-Earthlike conditions. Weather Patterns, Temperature Ranges, etc. Like how life can survive in high pressure environments like 500' below water. Or near sulphur or high radiation.
Use Earth Science terms
Your final paper should meet the following requirements: