In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small ...
"Have you ever flipped through old photo albums and suddenly found something fascinating hidden in the background of a ...
Arizona's dark skies are a haven for astronomers and photographers. Some communities are fighting to keep them that way.
Scientists predict Andromeda and the Milky Way will collide in about 4.5 billion years—reshaping the night sky forever!.
In 1610, astronomer Galileo Galilei used the newly invented telescope to show that the Milky Way was ... galaxy, then known as the Andromeda nebula, is a bright spot in the sky that intrigued ...
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