Skip to content
Skip to main content

About this free course

Download this course

Share this free course

Moons of our Solar System
Moons of our Solar System

Start this free course now. Just create an account and sign in. Enrol and complete the course for a free statement of participation or digital badge if available.

2.3 Lessons from Earth

Life on Earth started about 3.5 billion years ago. Think about how many species live on Earth today and how great is their variety.

To understand what life forms might be on Mars and on some of the moons of the Solar System, we need to focus on the earliest forms of life known on Earth – the very primitive forms. Archaea, for example, are very simple organisms that reproduce by cell division and can undergo evolution by changes in their genetic information. Being simple gives them a great advantage: they can be found in the most extreme environments, those that are hostile to more evolved forms of life. (The Life Marker Chip, mentioned near the end of the video, will no longer be included on the ExoMars Rover.)

Download this video clip.Video player: moons_1_vid063.mp4
Copy this transcript to the clipboard
Print this transcript
Show transcript|Hide transcript
Interactive feature not available in single page view (see it in standard view).