Ralph Waldo Emerson once penned the words “If the stars should appear one night in a thousand years, how would men believe ...

Particular stars called Cepheid variables allow astronomers to determine distance, and Hubble spotted one of these within M31 ...

Earth and our entire Milky Way galaxy may sit inside a mysterious giant hole which makes the cosmos expand faster here than in neighboring regions of the universe, astronomers say.

Astronomers have discovered 3I/ATLAS, only the third known interstellar object to enter our solar system—here’s what we know so far.

Cosmology news. From deep observations of the far reaches of space and time to spectroscopic analysis and more. Read cosmology articles and consider how astronomers view the origin of the universe.