Why is the Universe that we see a Universe of the past?

An expanding universe complicates this picture just a little bit, because the universe absolutely refuses to be straightforward. Objects are still emitting light, and that light takes time to travel ...

Thinking about the edge of the universe is one of those ideas that fascinates pretty much everyone. We can map […] ...

The surface of Earth is finite. We can measure it. If it was expanding, then its size would grow with time. And once again, good ol' Earth helps us understand what the universe might be doing beyond ...

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 ...

After a century of observations spanning the breadth of the cosmos and theoretical insights that push humanity's vision of the universe to its utmost limits, we can finally, confidently say that the ...

A century ago, Edwin Hubble began the race to the edge of the cosmos Damond Benningfield In 1930, Albert Einstein met with astronomers (including Edwin Hubble, at Einstein's left, back row) at Mount ...