In the quest to find alien life, scientists are searching for extrasolar Earth-Jupiter duos  

 Jupiter played a key role in life developing on Earth, so to boost the search for life outside the solar system, scientists have built a catalog of small, Earth-like planets with Jupiter-like siblings. 

https://cdn.mos.cms.futurecdn.net/2w7QKZdtT82EWhmkbMUoHL.jpg

https://www.space.com/earth-planets-jupiter-worlds-search-for-life