Galaxies

From yellow dwarfs to blue supergiants, stars continue to challenge astronomers' understanding of the universe

Leonard Susskind rebelled as a teen and never stopped. Today he insists that reality may forever be beyond reach of our understanding

A simple diagram, which celebrates its centennial this year, continues to serve as the most essential conceptual tool in stellar astrophysics

A gargantuan black hole has been spotted voraciously devouring material just 770 million years after the big bang

The galaxy cluster Abell 2744 contains so many unusual phenomena that astronomers have dubbed it "Pandora's Cluster," after the mythological box said to contain all the world's ills.

By one billion years after the big bang, galaxies and their resident black holes were already growing in tandem

A black hole 3.8 billion light-years from Earth is shown in this artist's representation tearing apart a star that drifted within its gravitational pull.

A rare, superluminous kind of stellar explosion does not fit into the usual supernova categories

Live from the New York University Skirball Center, Thursday, June 2, from 8 P.M.-9:30 P.M. ET

For four days in May, leading physicists and astronomers gathered in Baltimore to talk about the abundant but mysterious stuff that accounts for one quarter of the universe.