How do astronomers measure distance?

American soldiers have stood guard over the Tomb of the Unknown Soldier every minute of every day since July 2, 1937. Learn what this monument means and who's interred there in today's classic episode of BrainStuff, based on this article: https://people.howstuffworks.com/culture- ...  Show more

The zipper as we know it is barely over 100 years old, but it's the closure of choice for thousands of everyday products. Learn the history and physics behind the zipper (and why so many zipper tabs say 'YKK') in today's episode of BrainStuff, based on these articles: https://sci ...  Show more

Daniel talks about how astronomers can measure or deduce the mass of a star, and why it controls its fate.

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Astronomy Cast Ep. 717: Understanding the Ages of Distant Cosmic Objects by Fraser Cain & Dr. Pamela Gay Streamed live on Apr 22, 2024. How old is that star? That planet? That nebula? Figuring out the ages of astronomical objects is surprisingly challenging. Fortunately, astronom ...  Show more

What are our units of measure in astronomy? To begin our exploration of astronomy, we first need to develop a common language for notating large numbers, and introduce the basic units of length, mass, and time that we will use throughout the quarter. This lecture is a quick revie ...  Show more