The Hubble constant is one of the most important numbers in cosmology because it tells us how fast the universe is expanding, which can be used to determine the age of the universe and its history. It ...

In 1945, the victorious Allied powers gathered in San Francisco to draft a charter for the United Nations, the foundation of a new global order that would make another world war impossible.

Quasars were used as clocks to measure the passage of time right back to when the universe was a tenth of its current age. The breakthrough was the study of quasars in different wavelengths of ...