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PBS
The NEW Crisis in Cosmology
I have good news and bad news. Bad news first: two years ago we reported on the Crisis in Cosmology. Since then, it’s only gotten worse. And actually, the good news is also that the crisis in cosmology has actually gotten worse, which...
TED Talks
Naomi Oreskes: Why we should trust scientists
Many of the world's biggest problems require asking questions of scientists -- but why should we believe what they say? Historian of science Naomi Oreskes thinks deeply about our relationship to belief and draws out three problems with...
Khan Academy
Khan Academy: Stellar Parallax: Parsec Definition
Defines the word 'parsec,' which is a unit of distance in space, and explains its origin. Also demonstrates examples where this unit of measurement would be used.
Khan Academy
Khan Academy: Stellar Parallax: Stellar Distance Using Parallax
Gain an understanding of Stellar Distance Using Parallax in this in depth video. [11:40]
Khan Academy
Khan Academy: Stellar Parallax: Stellar Parallax
Video lecture provides an introduction to stellar parallax. [9:26]
Khan Academy
Khan Academy: Stellar Parallax: Stellar Parallax Clarification
Expands upon information in an earlier video on stellar parallax, in response to a viewer's question about angles and triangles.