Taxonomy term

orbit

Melting glaciers shift Earth's axis

A perfectly round desk globe spins evenly on a fixed axis, but that’s not the case with Earth, which wobbles as the position of its spin axis — the imaginary line running between the North and South poles — slowly drifts over time. In a new study in Earth and Planetary Science Letters, scientists suggest that there are three main reasons for the movement of Earth’s spin axis, called polar motion.

28 Jan 2019

October 31, 1992: Vacation reverses position on Galileo

More than three and a half centuries after the Vatican accused famed Italian astronomer Galileo Galilei of heresy, Pope John Paul II officially welcomed him back into the fold, dismissing the whole messy episode as a “tragic mutual incomprehension.” At issue in what has become known as the “Galileo affair” was planetary motion. In the early 1600s, nearly all Europeans believed that the universe revolved around Earth. Not only was the idea widely supported by most scientists, but scripture seemed to dictate that it was so. Theologians pointed to biblical passages such as Psalm 104 — which proclaims, “[The Lord] set the earth on its foundations; it can never be moved” — as evidence of a geocentric system.
 
31 Oct 2008