Like part of a cosmic Russian doll, our universe may be nested inside a black hole that is itself part of a larger universe. In turn, all the black holes found so far in our universe—from the ...

Christina Majaski writes and edits finance, credit cards, and travel content. She has 14+ years of experience with print and digital publications. Vikki Velasquez is a researcher and writer who has ...

Troy Segal is an editor and writer. She has 20+ years of experience covering personal finance, wealth management, and business news. Toby Walters is a financial writer, investor, and lifelong learner.