Cosmology and Astronomy - Khan Academy FREE

1) Scale of Earth and Sun

Scale of Earth and Sun More free lessons at: http://www.khanacademy.org/video?v=GZx3U

2) Scale of Solar System

Scale of Solar System More free lessons at: http://www.khanacademy.org/video?v=GP53b

3) Scale of Distance to Closest Stars

Scale of Distance to Closest Stars More free lessons at: http://www.khanacademy.org/video?v=jEeJk

4) Scale of the Galaxy

Scale of the Galaxy More free lessons at: http://www.khanacademy.org/video?v=rcLnM

5) Intergalactic Scale

Intergalactic Scale More free lessons at: http://www.khanacademy.org/video?v=JiE_k

6) Hubble Image of Galaxies

Hubble Image of Galaxies More free lessons at: http://www.khanacademy.org/video?v=Wl4re

7) Big Bang Introduction

8) Radius of Observable Universe

Radius of Observable Universe More free lessons at: http://www.khanacademy.org/video?v=6nVys

9) (Correction) Radius of Observable Universe

(Correction) Radius of Observable Universe More free lessons at: http://www.khanacademy.org/video?v=b6VQv

10) Red Shift

Red Shift More free lessons at: http://www.khanacademy.org/video?v=mx2M_

11) Cosmic Background Radiation

Cosmic Background Radiation More free lessons at: http://www.khanacademy.org/video?v=sxbPw

12) Cosmic Background Radiation 2

Cosmic Background Radiation 2 - Redshift of the Cosmic Background Radiation More free lessons at: http://www.khanacademy.org/video?v=06z7Q

13) Cosmological Time Scale 1

Cosmological Time Scale 1 More free lessons at: http://www.khanacademy.org/video?v=DRtLX

14) Cosmological Time Scale 2

Cosmological Time Scale 2 More free lessons at: http://www.khanacademy.org/video?v=LO7-3

15) Four Fundamental Forces

Gravity, Weak, Electromagnetic and Strong More free lessons at: http://www.khanacademy.org/video?v=FEF6P

16) Birth of Stars

Birth of Stars More free lessons at: http://www.khanacademy.org/video?v=i-NNW

17) Becoming a Red Giant

Becoming a Red Giant More free lessons at: http://www.khanacademy.org/video?v=kJSOq

18) White and Black Dwarfs

White and Black Dwarfs More free lessons at: http://www.khanacademy.org/video?v=EdYyu

19) A Universe Smaller than the Observable

A Universe Smaller than the Observable More free lessons at: http://www.khanacademy.org/video?v=0w9R_

20) Star Field and Nebula Images

Star Field and Nebula Images More free lessons at: http://www.khanacademy.org/video?v=w3IKE

21) Parallax in Observing Stars

Parallax in Observing Stars More free lessons at: http://www.khanacademy.org/video?v=ETzUp

22) Stellar Parallax

Another version of the stellar parallax introduction More free lessons at: http://www.khanacademy.org/video?v=omvNI

23) Stellar Distance Using Parallax

Stellar Distance Using Parallax More free lessons at: http://www.khanacademy.org/video?v=lVadj

24) Stellar Parallax Clarification

Stellar Parallax Clarification More free lessons at: http://www.khanacademy.org/video?v=6FP-h

25) Parsec Definition

Parsec Definition More free lessons at: http://www.khanacademy.org/video?v=6zV3J

26) Hubble's Law

Hubble's Law More free lessons at: http://www.khanacademy.org/video?v=1V9wV

27) Lifecycle of Massive Stars

Lifecycle of Massive Stars More free lessons at: http://www.khanacademy.org/video?v=UhIwM

28) Supernova (Supernovae)

Supernova (Supernovae) More free lessons at: http://www.khanacademy.org/video?v=qOwCp

29) Supernova clarification

Supernova clarification More free lessons at: http://www.khanacademy.org/video?v=QMv4k

30) Black Holes

Black Holes More free lessons at: http://www.khanacademy.org/video?v=JoL2p

31) Cepheid Variables 1

Cepheid Variables 1 More free lessons at: http://www.khanacademy.org/video?v=BWs-O

32) Why Cepheids Pulsate

Why Cepheids Pulsate More free lessons at: http://www.khanacademy.org/video?v=X_3QA

33) Why Gravity Gets So Strong Near Dense Objects

Why Gravity Gets So Strong Near Dense Objects More free lessons at: http://www.khanacademy.org/video?v=RpOHZ

34) Supermassive Black Holes

Supermassive Black Holes More free lessons at: http://www.khanacademy.org/video?v=DxkkA

35) Quasars

Quasars More free lessons at: http://www.khanacademy.org/video?v=4LmIy

36) Quasar Correction

Quasar Correction More free lessons at: http://www.khanacademy.org/video?v=PX_XS

37) Galactic Collisions

Collision of the Milky Way Galaxy with Andromeda (forming "Milkomeda") More free lessons at: http://www.khanacademy.org/video?v=QXYbG

38) Earth Formation

How the Earth is a the byproduct of a local supernova More free lessons at: http://www.khanacademy.org/video?v=VbNXh

39) Beginnings of Life

Life and photosynthesis start to thrive in the Archean Eon More free lessons at: http://www.khanacademy.org/video?v=nYFux

40) Ozone Layer and Eukaryotes Show Up in the Proterozoic Eon

Ozone Layer and Eukaryotes Show Up in the Proterozoic Eon. Great Oxygenation Event (Oxygen Catastrophe) More free lessons at: http://www.khanacademy.org/video?v=E1P79

41) Biodiversity Flourishes in Phanerozoic Eon

Cambrian explosion and biodiversity in the Phanerozoic Eon More free lessons at: http://www.khanacademy.org/video?v=MS7x2

42) First living things on land clarification

First living things on land clarification (This video copyrighted under Create Commons Attribution and Share-Alike CC-BY-SA license) More free lessons at: http://www.khanacademy.org/video?v=3gUE_ ...

43) Plate Tectonics-- Difference between crust and lithosphere

Plate Tectonics Introduction and Difference between crust and lithosphere More free lessons at: http://www.khanacademy.org/video?v=f2BWs

44) Structure of the Earth

Structure of the Earth - crust, mantle, core More free lessons at: http://www.khanacademy.org/video?v=4AxZ-

45) Plate Tectonics -- Evidence of plate movement

Plate Tectonics -- Evidence of plate movement More free lessons at: http://www.khanacademy.org/video?v=6EdsB

46) Plate Tectonics -- Geological Features of Divergent Plate Boundaries

Plate Tectonics -- Geological Features of Divergent Plate Boundaries More free lessons at: http://www.khanacademy.org/video?v=FK1s1

47) Plate Tectonics-- Geological features of Convergent Plate Boundaries

Geological features of Convergent Plate Boundaries More free lessons at: http://www.khanacademy.org/video?v=Y0eWn

48) Plates Moving Due to Convection in Mantle

Plates Moving Due to Convection in Mantle More free lessons at: http://www.khanacademy.org/video?v=f8GK2

49) Hawaiian Islands Formation

Hawaiian Islands formed by stationary hot spot under Pacific plate More free lessons at: http://www.khanacademy.org/video?v=D1eib

50) Compositional and Mechanical Layers of the Earth

Crust, mantle, core, lithosphere, asthenosphere, mesosphere, outer core, inner core More free lessons at: http://www.khanacademy.org/video?v=hHteU

51) Seismic Waves

S-waves and P-waves More free lessons at: http://www.khanacademy.org/video?v=NhioA

52) Why S-Waves Only Travel in Solids

Why S-Waves Only Travel in Solids More free lessons at: http://www.khanacademy.org/video?v=BTWLw

53) Refraction of Seismic Waves

Refraction of Seismic Waves More free lessons at: http://www.khanacademy.org/video?v=UNZ17

54) The Mohorovicic Seismic Discontinuity

The Mohorovicic Seismic Discontinuity- boundary between crust and mantle (or Moho) More free lessons at: http://www.khanacademy.org/video?v=yAQSu

55) How we know about the Earth's core

S-wave shadow and P-wave detection patterns give us information about the core More free lessons at: http://www.khanacademy.org/video?v=KL0i1

56) Pangaea

Pangaea - the idea of Pangaea and some of the evidence behind it More free lessons at: http://www.khanacademy.org/video?v=axB6u

57) Scale of the Large

Attempting to comprehend the scale of the large More free lessons at: http://www.khanacademy.org/video?v=5FEjr

58) Scale of the Small

From honey bees to cells, virus, and atoms -- understanding the scale of the very small More free lessons at: http://www.khanacademy.org/video?v=ERKx3

59) Detectable Civilizations in our Galaxy 1

A framework for thinking about how many detectable civilizations are out there. More free lessons at: http://www.khanacademy.org/video?v=YYEgq

60) Detectable Civilizations in our Galaxy 2

Why do we even care about the Drake Equation. Thinking about the fraction of a planet's life when a civilization might be detectable. More free lessons at: http://www.khanacademy.org/video?v=jN03g ...

61) Detectable Civilizations in our Galaxy 3

Reconciling with the traditional Drake Equation More free lessons at: http://www.khanacademy.org/video?v=LRmwU

62) Detectable Civilizations in our Galaxy 4

Taking a shot at estimating the number of detectable civilizations More free lessons at: http://www.khanacademy.org/video?v=T5DGZ

63) Detectable Civilizations in our Galaxy 5

More reasons why we haven't detected anything yet. More free lessons at: http://www.khanacademy.org/video?v=xL9ej

64) Human Evolution Overview

From the extinction of the dinosaurs to humanity More free lessons at: http://www.khanacademy.org/video?v=frE1r

65) Understanding Calendar Notation

Difference between BC, BCE, AD and CE. A little bit about the birth of Jesus as well. More free lessons at: http://www.khanacademy.org/video?v=EKKe7

66) Correction Calendar Notation

Correcting the time difference calculation by taking into account that there is no year 0 More free lessons at: http://www.khanacademy.org/video?v=N06Jy

67) Development of Agriculture and Writing

The Paleolithic and Neolithic eras of the Stone Age. More free lessons at: http://www.khanacademy.org/video?v=iU58A

68) Introduction to Light

Light and electromagnetic radiation More free lessons at: http://www.khanacademy.org/video?v=rLNM8

69) Seasons Aren't Dictated by Closeness to Sun

Why our closeness to the sun does not dictate the seasons More free lessons at: http://www.khanacademy.org/video?v=SJUd5

70) How Earth's Tilt Causes Seasons

How being Earth's tilt causes seasons More free lessons at: http://www.khanacademy.org/video?v=05qDI

71) Milankovitch Cycles Precession and Obliquity

How changes in Earth's rotation can effect Earth's seasons and climate More free lessons at: http://www.khanacademy.org/video?v=ZD8TH

72) Are Southern Hemisphere Seasons More Severe?

Are Southern Hemisphere seasons more severe because of the eccentricity in Earth's orbit? More free lessons at: http://www.khanacademy.org/video?v=umvNQ

73) Precession Causing Perihelion to Happen Later

Clarifying the effect of axial precession on the calendar and the date of perihelion and aphelion More free lessons at: http://www.khanacademy.org/video?v=2o-Se

74) What Causes Precession and Other Orbital Changes

What causes precession and other orbital changes More free lessons at: http://www.khanacademy.org/video?v=nL6LM

75) Apsidal Precession (Perihelion Precession) and Milankovitch Cycles

Apsidal Precession (Perihelion Precession) More free lessons at: http://www.khanacademy.org/video?v=m6lMG

76) Firestick Farming

How the indigenous Australians used fire to change their environment More free lessons at: http://www.khanacademy.org/video?v=mwUya

77) Carbon 14 Dating 1

Carbon 14 Dating 1 More free lessons at: http://www.khanacademy.org/video?v=8wYvK

78) Carbon 14 Dating 2

Carbon 14 Dating 2 More free lessons at: http://www.khanacademy.org/video?v=4YUtn

79) Potassium-Argon (K-Ar) Dating

How K-Ar dating can be used to date very old volcanic rock and the things that might be buried in between More free lessons at: http://www.khanacademy.org/video?v=NMZ5k

80) K-Ar Dating Calculation

Working through a calculation for K-Ar dating (good to have some prior experience with e and logarithms) More free lessons at: http://www.khanacademy.org/video?v=iLFcS

81) Chronometric Revolution

Discussion of the relatively recent changes in our ability as a species to shine light on our deep past More free lessons at: http://www.khanacademy.org/video?v=5mNTv

82) Collective Learning

How symbolic language drives collective learning and how this is one of the truly differentiating aspects of human beings relative to the rest of the animal kingdom More free lessons at: http://www.k ...

83) Land Productivity Limiting Human Population

Thinking about how we get Calories from the land limits human population densities More free lessons at: http://www.khanacademy.org/video?v=xM8sz

84) Energy Inputs for Tilling a Hectare of Land

Thinking about energy consumption for tilling land More free lessons at: http://www.khanacademy.org/video?v=5I9dH

85) Random Predictions for 2060

Sal's random predictions for the year 2060 More free lessons at: http://www.khanacademy.org/video?v=E4rbS