"Cosmic archaeologists" have discovered an iron-deficient second-generation star, which provides evidence of how ancient stars enriched their successors.

Imagine embarking on a journey aboard a spaceship, heading in one direction as far as possible from Earth. Now, imagine that the spaceship can constantly accelerate up to the speed of light, and you ...

Prologue: Cosmology's extraordinary new frontiers -- How far out can we see? : voyage to the edge of the known universe -- How was the universe born? : reavealing the dawn of time -- How far away will ...

The edge of the universe is not a wall, but a limit defined by time, light, and expansion. What we call the observable ...

Observations show the universe appears flat, yet its true size and global shape beyond the observable horizon may remain forever unknown.