One large Milky Way galaxy or many galaxies? 100 years ago, a young Edwin Hubble settled astronomy’s ‘Great Debate.’
In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small ...
Scientists look to the Miocene for clues of what we might expect from global heating caused by fossil fuels
Projections of our future under climate change paint a picture of extreme weather and acidified oceans, a world many of today ...