A visit to the former Inca Empire reveals epic feats of construction and engineering that have withstood the test of time, ...

They found that the structure — dubbed "Quipu" after strings with knots used by the Incas for bookkeeping — stretched across huge swathes of the night sky. The team believes it's largely ...

Astronomers have been recording the signal for more than four decades, but this is the first time they've nabbed its origin.

Mar. 11, 2025 — A new study presents a compelling new model for the formation of super-Earths and mini-Neptunes -- planets that are 1 to 4 times the size of Earth and among the most common in ...