Welcome back to my blog! This post is for the second Action Project of the STEAM class, Frontiers. This class has been about the frontiers of science and discovery in space and the oceans. We studied marine ecology, biology, geology, and physiology in the first unit. We also looked at technological frontiers in the maritime sector, such as ways to clean up ocean pollution, capture carbon dioxide, and rebuild coral reefs. In this unit, we have looked at the stars, planets, and galaxies around us. We have learned about how the universe came to exist and how humans began to study it. For this Action Project, we have been tasked with writing a research paper about a frontier of our choosing in the field of space exploration. For my paper, I decided to look into propulsion systems or the types of rockets that can bring humans or crewless spacecraft from the Earth's surface into orbit. Propulsion systems have been researched and built for many years, so in a general sense, they aren'...