Seven exoplanets orbiting a dwarf star has been discovered. How are these different to our solar system? Why it is easier to detect them?

Seven exoplanets orbiting a dwarf star has been discovered. How are these different to our solar system? Why it is easier to detect them? (GS 3)

सात एक्षॉपलनेंट की खोज की गई है। ये कैसे हमारे सौर मंडल से अलग हैं? उन्हें पता लगाना क्यों आसान है?