A view of the central region of the Perseus galaxy cluster, one of the most massive objects in the universe, shows the ...

The Hubble Space Telescope was designed to free astronomers of a limitation that has plagued them since the days of Galileo—Earth's atmosphere. Shifting air pockets in the atmosphere block and distort ...

Add Yahoo as a preferred source to see more of our stories on Google. In space, there are four dimensions: length, width, height and time. scaliger/iStock/NASA via Getty Images Plus About a century ...

Text, photographs, paintings, and maps explore the history of astronomy, the solar system, and new space discoveries.