The arrival of a visitor from beyond our solar system is a cosmic event of staggering rarity, yet it has just happened for only the third time in human history. Imagine a silent, billion-year journey ...

New images taken with the Gemini North telescope in Hawaii confirm that the interstellar comet 3I/ATLAS has gotten brighter ...

A rocky exoplanet outside the Earth's solar system may have an atmosphere, according to new evidence gathered by NASA ...

Here's how an atmospheric river, particularly the powerful Pineapple Express, works and why it can carry so much ...

As another atmospheric river inundates the Pacific Northwest, here are key words to know to understand flooding in WA.

A brilliant point of light is rising in the eastern sky soon after dark this month, drawing comparisons to the "Star of ...