Fomalhaut b
Videos
Fomalhaut b, formally named Dagon, is an expanding dust cloud and former candidate planet observed near the A-type main-sequence star Fomalhaut, approximately 25 light-years away in the constellation
Comparison between the Solar System and the system around Fomalhaut
Fomalhaut b as observed from 2004 to 2006 (discovery image)
Fomalhaut b as observed from 2004 to 2012
Artistic rendition of Fomalhaut b as a planet revolving around its parent star, a model which has now been disproven
Planetesimal
Videos
Planetesimals are solid objects thought to exist in protoplanetary disks and debris disks. Believed to have formed in the Solar System about 4.6 billion years ago, they aid study of its formation.
Debris disks detected in HST archival images of young stars, HD 141943 and HD 191089, using improved imaging processes (24 April 2014).
PDS 70