1.1 Stars, planets and galaxies
1.2 Exploring the Galaxy
1.3 The discovery of interstellar matter
1.4 The emptiness of space
1.5 Interstellar matter, pro and con
2.1 Electromagnetic waves
2.2 The speed of light
2.3 Frequency
2.4 Photons and energy
2.5 The transport of energy
2.6 Distortion of electromagnetic waves
2.7 Walls and windows
2.8 Tools of the trade: telescopes
3.1 The structure of the atom
3.2 Energy levels and transitions
3.3 Spectral lines
3.4 The Doppler effect
3.5 Tools of the trade: spectroscopy
3.6 Molecules
3.7 Solids
3.8 Temperature
4.1 The 21cm line
4.2 Atomic hydrogen in galaxies
4.3 Measuring the mass of a galaxy
4.4 Tools of the trade: radio astronomy
4.5 Atomic hydrogen in the Milky Way
4.6 Interstellar clouds
4.7 Gas motions in the interstellar medium
5.1 Photoionization
5.2 Exciting stars
5.3 Tools of the trade: astronomical photography
5.4 The light from an H+ region
5.5 Forbidden lines from ions
5.6 Radio and infrared emission from H+ regions
5.7 The warm ionized medium
5.8 Coronal gas
6.1 Interstellar helium
6.2 Heavy elements in H+ regions
6.3 Tools of the trade: ultraviolet astronomy
6.4 Abundances from visible and ultraviolet absorption lines
6.5 Abundances in the Solar System
7.1 Extinction and reddening
7.2 Scattered light
7.3 Infrared emission
7.4 Tools of the trade: infrared astronomy
7.5 Sizes and shapes of dust particles
7.6 The nature of interstellar grains
7.7 How much dust is there?
8.1 Molecular spectroscopy
8.2 Hydrogen molecules in transparent clouds
8.3 Vibrationally excited hydrogen molecules
8.4 Interstellar chemistry
8.5 Dense molecular clouds
8.6 Tools of the trade: millimeter-wave astronomy
8.7 Living in a molecular cloud
8.8 Molecular clouds in the Galaxy
8.9 Interstellar masers
9.1 Fields and particles
9.2 Cosmic rays in the Galaxy
9.3 Gamma rays from the Galaxy
9.4 Tools of the trade: cosmic ray and gamma ray telescope
9.5 Galactic radio emission
9.6 Sources of cosmic rays
9.7 The nature of interstellar magnetism
9.8 Measuring the galactic magnetic field
10.1 The origin of the elements
10.2 Mass loss from stars
10.3 Planetary nebulae
10.4 Supernovae
10.5 Tools of the trade: X-ray telescopes
10.6 Novae and other binary systems
10.7 Formation and destruction of dust
11.1 Towards a taxonomy
11.2 Heating and cooling of the interstellar medium
11.3 Coronal gas revisited.
11.4 Bubbles, tunnels, onions and sheets
11.5 The local neighborhood
11.6 The galactic halo
12.1 Recognizing young stars
12.2 Gravity and clouds
12.3 Stability and collapse
12.4 Magnetic pressure
12.5 Protostars
12.6 Tools of the trade: computers in astronomy
12.7 The problem of rotation
12.8 Outflows and winds
12.9 High mass stars
12.10 The fate of the interstellar medium
13.1 Interplanetary dust
13.2 The origin and fate of interplanetary dust
13.3 The solar wind
13.4 Interstellar gas within the Solar System
13.5 The edge of the Solar System.
14.1 Gravitational equilibrium
14.2 Dissociation and ionization
14.3 The magnetosphere
15.1 Fountains, bridges, and starbursts
15.2 Hot gas in galaxy clusters
15.3 Quasar absorption lines
15.4 Dark matter
A: Large and small numbers
B: The metric system and related units
C: Greek letters
D: Wavelength, frequency and energy
E: Selected chemical elements
F: The Doppler effect
G: Temperature, energy and pressure
H: Thermal radiation
I: Galactic rotation
J: Atmospheres and gravity
K: The magnitude scale.
L: Boltzman's equation
M: The Jeans criterion
Gareth Wynn-Williams (wynnwill@ifa.hawaii.edu)
Last modified December 19, 2001
