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Pbs Learning Media: Crash Course Astronomy: Uranus & Neptune
We complete our planetary tour with a review of the ice giants Uranus and Neptune. Both have small rocky cores, thick mantles of ammonia, water, and methane, and atmospheres that make them look greenish and blue. Uranus has a truly weird...
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Pbs Learning Media: Crash Course Astronomy: Exoplanets
There are other planets out there, and astronomers have a lot of methods for detecting them. Nearly 2000 planets have been found so far. The most successful method for finding them is using transits, where a planet physically passes in...
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Pbs Learning Media: Crash Course Astronomy: Telescopes
Host Phil Plait explains how telescopes work and offers up some astronomical shopping advice. In this episode, we learn how telescopes do two things: collect light, and increase our ability to resolve details. Learn the difference...
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Pbs Learning Media: Crash Course Astronomy: Dark Matter
Today on Crash Course Astronomy, Phil dives into some very dark matters. The stuff we can actually observe in the universe isn't all there is. Galaxies and other large structures in the universe are created and shifted by a force we...
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Pbs Learning Media: Crash Course Astronomy: Black Holes
Stellar mass black holes form when a very massive star dies, and its core collapses. Black holes come in different sizes, but for all of them, the escape velocity is greater than the speed of light, so nothing can escape, not matter or...
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Pbs Learning Media: Crash Course Astronomy: Moon Phases
Learn why the moon has phases and what those phases are. Because the moon is a sphere and orbiting the earth every 29.5 days, the way we see it in the night sky changes with time. Learn what the phases of the moon are: why they occur,...
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Pbs Learning Media: Crash Course Us History: Obamanation
In which John Green teaches you about recent history. John covers the end of George W. Bush's administration and the presidency of Barack Obama (so far). John will teach you about Obama's election, some of his policies like the...
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Pbs Learning Media: Crash Course Astronomy: Brown Dwarfs
While Jupiter is nowhere near massive enough to initiate fusion in its core, there are even more massive objects out there that fall short of that achievement, and they are called brown dwarfs. Brown dwarfs have a mass that places them...
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Pbs Learning Media: Crash Course Us History: The New Deal
In which John Green teaches you about the New Deal, which was President Franklin D. Roosevelt's plan to pull the United States out of the Great Depression of the 1930's. John will teach you about some of the most effective and some of...
PBS
Pbs Learning Media: Crash Course Us History: The Cold War
In which John Green teaches you about the Cold War, which was the decades long conflict between the USA and the USSR. The Cold War was called cold because of the lack of actual fighting, but this is inaccurate. There was plenty of...
PBS
Pbs Learning Media: Crash Course Astronomy: The Milky Way
Today we're talking about our galactic neighborhood: The Milky Way. It's a disk galaxy, a collection of dust, gas, and hundreds of billions of stars, with the Sun located about halfway out from the center. [10:59]
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Pbs Learning Media: Crash Course Astronomy: Neutron Stars
In the aftermath of an 8-20 solar mass star's demise we find a weird little object known as a neutron star. Neutrons stars are incredibly dense, spin rapidly, and have very strong magnetic fields. Neutrons stars with the strongest...
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Pbs Learning Media: Crash Course Astronomy: Distances
How do astronomers make sense out of the vastness of space? How do they study things so far away? Today Phil talks about distances, going back to early astronomy. Ancient Greeks were able to determine the the size of the Earth, and from...
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Pbs Learning Media: Crash Course Astronomy: Deep Time
As we approach the end of Crash Course Astronomy, it's time now to acknowledge that our Universe's days are numbered. [15:00]
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Pbs Learning Media: Crash Course Astronomy: Nebulae
Astronomers study a lot of gorgeous things, but nebulae might be the most breathtakingly beautiful of them all. Nebulae are clouds of gas and dust in space. Some nebulae are small and dense, others can be dozens or hundreds of light...
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Pbs Learning Media: Crash Course Astronomy: The Moon
Take a tour of the moon, the closest astronomical object to Earth. Learn theories of the moon's formation, understand its surface features and how they formed, like the highlands and maria, and the moon's internal structures. [9:47]
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Pbs Learning Media: Crash Course Astronomy: Eclipses
In this episode, Phil breaks down what happens during a solar and lunar eclipse and provides tips for safely viewing a solar eclipse. Learn how the Ancient Greeks calculated a close estimation of the earth and moon's actual size two...
PBS
Pbs Learning Media: Crash Course Astronomy: The Earth
Learn all about planet Earth, from the composition of its internal structure and core, to its shifting continental plates, and placement in the solar system. We take a tour of Earth's inner and outer core, the origins of the planet's...
PBS
Pbs Learning Media: Crash Course Astronomy: Asteroids
Asteroids are chunks of rock or metal, or both, that were once part of a planet, but were destroyed after collisions. Most asteroids orbit the Sun between Mars and Jupiter, but some get near the Earth. The biggest asteroid, Ceres, is far...
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Pbs Learning Media: Crash Course Government and Politics: How a Bill Becomes a Law
The process of how a bill becomes a law can be pretty complex. As if just getting through committee isn't difficult enough, bills have to navigate a series of amendments and votes in both houses, potentially more committees, further...
PBS
Pbs Learning Media: Crash Course Government and Politics: Congressional Leadership
In this episode, Craig Benzine explores the leadership structure of congress. We'll break out the clone machine to examine the responsibilities of the speaker of the house, the majority and minority leaders, as well as the majority and...
PBS
Pbs Learning Media: Crash Course Government and Politics: Congressional Committees
In this episode, Craig Benzine discuses the role of committees in congress. We'll talk about standing committees, joint committees, conference committees, and caucuses (and not the candidate-choosing kinds), as well as the staff agencies...
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Pbs Learning Media: Crash Course Artificial Intelligence: Unsupervised Learning #6
We're moving on from artificial intelligence that needs training labels, called Supervised Learning, to Unsupervised Learning which is learning by finding patterns in the world. We'll focus on the performing unsupervised clustering,...
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Pbs Learning Media: Crash Course Artificial Intelligence: Training Neural Networks #4
We're going to talk about how neurons in a neural network learn by getting their math adjusted, called backpropagation, and how we can optimize networks by finding the best combinations of weights to minimize error. [12:08]