How is the total mass of the universe calculated? Bob GiddingsGreen Bay, Wisconsin Calculating the total mass of the universe ...

The universe exists because matter and antimatter are not good friends. Is there a scientific reason why the universe exists?

Modern cosmology reveals a universe expanding uniformly without a spatial center or edge. The Big Bang wasn't a localized ...

If you think a galaxy is big, compare it to the size of the universe: it's just a tiny dot which, together with a huge number ...

The origin of our Universe remains one of the greatest enigmas of science, a question that seems to defy the limits of our ...

Here’s what you’ll learn when you read this story: Mathematical evidence indicates that our universe is flat, but it could be infinitely big, as well. You can figure out if an object is flat with a ...

Some astronomers think one set of measurements or the other will turn out to be wrong. Others believe that the tension is a hint of deeper problems with the scientific description of the universe, ...

Scientists ultimately settled on a feeding black hole at the heart of a far-distant galaxy as the most likely engine for 3C ...

No one knows what kicked off the Big Bang that eventually allowed the stars to begin forming. Adolf Schaller for STScI, CC BY How can a Big Bang have been the start of the universe, since intense ...

Let me first tell you how mysterious dark energy is. Einstein added a cosmological constant to his equations to keep the ...

Watch Pop Mech ’s Jackie Appel reveal the story of how two men from New Jersey named Arno Penzias and Robert Wilson made one of the most important discoveries in the history of astronomy—by accident.