What are the two main differences between extrasolar planetary systems discovered to date and our Solar System?

Question

Lincoln Adams · Accepted Answer

The biggest single difference is the small number of planets in extra-solar systems. The second is that very few of them are in a life-supporting zone.

The potential for colonization or even the emergence of life forms other than those that are currently known to exist on Earth is what makes planetary systems interesting. The first step is to HAVE planets, which the systems that have been detected so far have not had many of; the second is for a planet to be in an energy zone where life (as we know it) can exist, of which Earth is the only planet so far!

Everett Abrams · Answer

undefined 1. Diverse orbital characteristics: In contrast to our Solar System, extrasolar planetary systems frequently display different orbital sizes and shapes.
2. Diverse planet compositions: Unlike our planets, which are primarily found in our rocky inner and gas giant outer regions, many extrasolar planets have unique compositions, including "hot Jupiters" near to their stars.