Pope Francis on Monday signed a decree that recognized the 20th-century visionary’s “heroic virtues” and put him on the path ...

Astronomers tallying up all the normal matter—stars, galaxies and gas—in the universe today have come up embarrassingly short ...

New research has revealed that the cosmological model developed by Nicolaus Copernicus, the renowned European Renaissance ...

Before Einstein, special relativity, and E = mc2, what was the prevailing theory on the Sun's seemingly eternal energy?

Cecrops, Athens’ first king, banned bloody sacrifices and reformed worship with laws, morality, and symbolic offerings.