What's the size of the Milky Way galaxy? Learn how, depending on your definition, the size can change.

A Carnegie-led team of astronomers detected the strongest evidence yet of an atmosphere around a rocky planet beyond our ...

In 2025, astronomers sharpened their view of the planetary system around Proxima Centauri — the sun's closest stellar ...

Fourth anniversaries aren’t often causes for celebration. But in the case of the James Webb Space Telescope (JWST), which ...

So, to create a must-read story list for you, we asked our staff to select their favorite pieces of 2025. Alas, while you're ...

Our memories from 2025 include sadness in a detention hearing, heavy rain that fell quickly and a college athlete who is suing the NCAA.

Distance records are an excellent proxy for the state of the art in astronomy. Finding extremely faraway galaxies is hard. In ...

From our vantage point inside it, the Milky Way can feel infinite, a hazy river of light that wraps around the sky. Yet when ...

From Viking to Perseverance, scientists have spent decades chasing chemical hints that could point to life beyond Earth.

The Artemis II mission, which could launch as early as February, is expected to send four astronauts on a trip to the moon, ...

From new exoplanetary neighbors and a weakening dark energy to the best evidence for life on Mars and an interstellar comet ...

New observations reveal that the relationship between ultraviolet and X-ray light in quasars has changed over billions of ...