Why do we even care about the Drake Equation. Thinking about the fraction of a planet's life when a civilization might be detectable. Created by Sal Khan.
Reconciling with the traditional Drake Equation. Created by Sal Khan.
Taking a shot at estimating the number of detectable civilizations. Created by Sal Khan.
More reasons why we haven't detected anything yet. Created by Sal Khan.
The Paleolithic and Neolithic eras of the Stone Age. Created by Sal Khan.
Thinking about energy consumption for tilling land. Created by Sal Khan.
How the indigenous Australians used fire to change their environment. Created by Sal Khan.
First living things on land clarification (This video copyrighted under Create Commons Attribution and Share-Alike CC-BY-SA license). Created by Sal Khan.
An introduction to Gravity, Weak, Electromagnetic and Strong Forces. Created by Sal Khan.
Collision of the Milky Way Galaxy with Andromeda (forming "Milkomeda"). Created by Sal Khan.
The Hawaiian Islands formed primarily as a result of volcanic activity. While most islands form near tectonic plate boundaries, the Hawaiian Islands are nearly 2000 miles away from the nearest plate margin. Therefore, scientists believe that the islands formed due to the presence of the Hawaiian "hot spot," a region deep in the Earth's mantle from which heat rises. This heat produces melted rock (magma), which then pushes through the crust and solidifies. Created by Sal Khan.
How Earth's tilt causes seasons. Created by Sal Khan.
S-wave shadow and P-wave detection patterns give us information about the core. Created by Sal Khan.
A presentation of some Hubble Image of Galaxies. Created by Sal Khan.
Hubble's Law. Created by Sal Khan.
From the extinction of the dinosaurs to humanity. Created by Sal Khan.
An introduction to Intergalactic Scale. Created by Sal Khan.
Light and the electromagnetic radiation spectrum. Wave and particle-like behavior, and how to calculate the wavelength or frequency of a light wave. Created by Sal Khan.
The Moon and the sun look roughly the same size in the sky because although the sun’s diameter is ~400 times greater than the Moon’s, the sun is ~400 times farther away from the Earth as the Moon is! The Moon goes through phases because as it rotates around the Earth, different parts of the Moon are made visible to us from the sun’s light. Created by Sal Khan.
Working through a calculation for K-Ar dating (good to have some prior experience with e and logarithms). Created by Sal Khan.