Tags: earth

Is Earth the Only Planet With Tectonic Plates?

On Earth, plate tectonics build up mountains, set off tsunamis and form volcanoes. To paraphrase the late evolutionary biologist Theodosius Dobzhansky, nothing about the world’s surface makes sense except in...

The Moon Is Causing Longer Days on Earth

The full moon in Morocco on Jan. 1, 2018. Researchers say days have lengthened from about 18 hours to 24 hours during the last 1.4 billion years because the moon...

Hollow Earth Theory

In the early 19th century an American eccentric, John Cleves Symmes (1779-1829), sought funding for an expedition to enter the Earth through one of two 4,000-mile wide polar holes. Inside...

Should We Cloak Earth to Hide It From Evil Aliens?

Theoretical physicist Stephen Hawking raised a stir back in 2010, when he warned that researchers should resist the urge to try communicating with extraterrestrial intelligent life, should they ever find...