How Do Astronomers Measure Distances in Space? The Cosmic Distance Ladder Explained
How can anyone know that a star is 400 light-years away when nobody has ever been there? In the Crash Course Astronomy episode above, Phil[…]
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The Hubble Deep Field: The 1995 Photo That Changed Astronomy
In December 1995 the Hubble Space Telescope pointed at a patch of sky that appeared completely empty and kept looking for ten days. The result,[…]
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Hubble’s Universe: Greatest Discoveries and Latest Images
Praise for the first edition: “Superbly well produced. Any engagement with this ‘cosmic portfolio,’ from picture gazing to deep reading, is grandly rewarded.” –Booklist [starred[…]
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