Joe MurchisonPlacerville, California Astronomers widely accept that the universe formed in theContinue reading "How can the visible universe be 46 billion light-years in radius when the universe ...

Thus, we are surrounded by a "horizon" that we cannot look beyond—a horizon set by the distance that light can travel over the age of the universe. This horizon describes the visible universe ...

It’s the most distant thing we can see. Earth is at the center of this spherical shell—illustrated here—and our visible universe lies within. Penzias and Wilson’s 1965 discovery of this radiation ...

The visible universe—including Earth, the sun, other stars, and galaxies—is made of protons, neutrons, and electrons bundled together into atoms. Perhaps one of the most surprising discoveries ...

And since the universe was kind of created 13.8 billion years ago, there's a finite distance that we can see. We can almost see the edge of the visible universe. In fact, the earliest thing that ...

It's therefore categorized as a polycyclic aromatic hydrocarbon (PAH) — one of the most abundant complex molecules in the visible universe. PAHs were first detected in the 1960s, in meteorites ...

The first piece of the Euclid space telescope's map of the universe is crammed with 14 million galaxies and 100 million sources of light. The mapping project is now 1% done.

For me the revelation came the first time I took a photograph of that galaxy and realized that just because the visible universe is so far away didn’t mean I needed a big telescope to photograph it.

The rest is so-called dark matter, invisible and aloof but with sufficient gravity to hold the visible universe together. Countless particles have been hypothesized as candidates for dark matter.

Luca Ciotti - Full Professor, Alma Mater Studiorum - Università di Bologna ‘Any physicist or physics student who wants an introduction to astrophysics would do well to start here: it is a great survey ...