A milestone in physics: In 2015, scientists proved the existence of gravitational waves. These waves travel billions of light-years through space, eventually reaching Earth and bringing us insights that were previously unattainable.
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Brian Cox discusses the elements of which all living things, including humans, are made. He explores the beginnings of the universe and the origins of humanity, going far back in time to look at the process of stellar evolution.
S1E2 • Wonders of the Universe • Astronomy
A young Carl Sagan realizes his childhood dreams, carrying his mentors' research forward.
6/13 • Cosmos: Possible Worlds • 2020 • Astronomy
In this episode of Crash Course Astronomy, Phil takes you through the cause and name of the Moon's phases.
#4 • Crash Course Astronomy • Astronomy
Double stars are stars that appear to be near each other in the sky, but if they’re gravitationally bound together we call them binary stars. Many stars are actually part of binary or multiple systems. If they are close enough together they can actually touch other, merging into one peanut-shaped star. In some close binaries matter can flow from one star to the other, changing the way it ages. If one star is a white dwarf, this can cause periodic explosions, and possibly even lead to blowing up the entire star.
34 • Crash Course Astronomy • 2015 • Astronomy
Welcome to the first episode of Crash Course Astronomy. Your host for this intergalactic adventure is the Bad Astronomer himself, Phil Plait. We begin with answering a question: "What is astronomy?"
#1 • Crash Course Astronomy • Astronomy
What is dark energy? What is dark matter? Well, if we knew exactly we would have a nobel prize – we know that they exist though. So what do we know about those strange things?
In a Nutshell • 2015 • Astronomy