Dark energy—the term used to describe whatever is causing the universe to expand at an increasing rate—is one of the universe ...

As the universe expands, it feels like it must be spreading out from some initial point. But a physicist explains why that’s ...

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

The universe has many secrets we'll never discover, and the domain wall is one of them. I The expansion is ongoing, and it ...

That cosmologists cannot agree on one of the most elementary facts about the universe is striking enough. But that uncertainty produces others, too: it makes it impossible to calculate an exact age ...

The universe is expanding, and while that fact is fascinating, it also creates a question that trips people up: if […] ...

For more than two decades, the standard model of cosmology has stood as a reliable guide to the universe. Known as Lambda Cold Dark Matter, or ΛCDM, it weaves together dark energy, dark matter, and ...

The two keys to Edwin Hubble's breakthrough discovery were forged by others in the 1910s. The first key, the period-luminosity scale discovered by Henrietta Leavitt, allowed astronomers to calculate ...