A rare interstellar comet reveals its secrets

Coming soon: Watch out for the upcoming launch of Wonder Theory, the first-ever CNN space and science newsletter. Subscribe here and be among the first to receive the week’s most fascinating stories, delivered straight to your inbox every Saturday morning.Coming soon: Watch out for the upcoming launch of Wonder Theory, the first-ever CNN space and science newsletter. Subscribe here and be among the first to receive the week’s most fascinating stories, delivered straight to your inbox every Saturday morning.