Astronomy Picture of the Day

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Exams: Midterm 1 Study Guide, Sample Questions 1
Midterm 2 Study Guide, Sample Questions 2
Final Exam Study Guide

Apparent Motions in the Sky

South Celestial Pole
Solar Eclipse
Lunar Eclipse
Retrograde Motion of Mars
Retrograde Motion Schematic
Phases of the Moon (animated)
Phases of Venus
"Earth Rise"

Light and Telescopes

Waves: transverse and longitudinal
EM Spectrum of radiation
Pictures taken with an Infra-Red camera
Periodic Table of Elements and their Spectral lines
Electronic energy levels and transitions in a Hydrogen atom
Two ways of showing emission and absorption spectra (Nick Strobel's Astronomy Notes; www.astronomynotes.com
Blackbody, or Thermal Radiation Spectrum
Three types of spectra: continuous (example: thermal), absorption, emission
Doppler Effect applet
Breaking the sound speed - a picture of the sonic boom
Diffraction applet
Explanation of Optics, and Pictures of Telescopes (taken from prof. J. Dickey)
Gemini optical telescope
Night Sky
Arecibo Radio Observatory, largest single dish

Formation of the Solar System --- Examples of Protoplanetary Systems

A portrait of Solar System planets (distances NOT to scale)
Artist's conception of the Solar System during formation
Stages in the formation of the Solar System
Solar System debris
The astronomers' Periodic Table of Elements
Horsehead Nebula, a Star forming region
Eagle Nebula, a Star forming region
Protoplanetary Disks in Orion Nebula
A close-up of some Protoplanetary Disks
A Schematic View of Protoplanetary Disks in a Star Forming Region
Extrasolar Planets

Cratering in the Solar System

Pieces of comet Shoemaker-Levy 9
Comet Shoemaker-Levy 9 swallowed by Jupiter
Crater Chain on Ganymede
Impact crater on Mimas
Meteor Crater in Arizona
News Flash!!!

Earth, and the terrestrial planets

A schematic of Ocean tides
The Inner Planets
Venus, with and without the cloud cover
Plate Tectonics (USGS site)
Plate Tectonics, animation (UArizona site)
Ozone depletion over Antarctic, 1950 to present
Global Warming and CO2
Gullies on Mars
Gullies and Channels on Mars
Dust devil on Mars
Aurora Borealis (Neville Public Museum Astr Soc, Green Bay WI, D. Clausen)
Inclination of planets' axes of rotation

Jovian planets

Planets' Interiors
Jupiter's Great Red Spot
Jupiter's Galilean satellites
Galileo Mission to Jupiter
Io, Jupiter's moon, in true color
Volcanic eruption in progress on Io
Volcanic eruptions and its plume, on Io
Callisto, Jupiter's moon
Saturn's rings
Uranus
Neptune
Pluto -- an artist's vision
Gaps in the Asteroid Belt

Einstein's Relativity Theory

Special Relativity (Prof. Pogge's web-site at OSU)
Warping of Space-time
Gravitational redshift (Dr. Hamilton)
Gravitational Lenses Database

The Sun

Sun's image in Hydrogen-alpha emission lines
National Solar Observatory, Sunspot, New Mexico
Solar Spectrum
A close-up of a sunspot
Solar cycle (1995-present)
Solar cycle (1880-2000)
Solar Corona seen during Solar eclipse
Solar prominence of Jan 17-18 2000, animation
Sun at Extreme UV wavelengths - short animations
Neutrino Detector, Sudbury, Ontario, Canada
History of neutrino discovery
More interesting information about neutrinos
Doppler Image of Sun's rotation
Solar granulation
Solar 5-minute oscillations
Another mode of Solar oscillations

Stars

HR diagram
Cepheids
More on Cepheids
Planetary Nebulae (APOD)
Supernova Remnant (Tycho's)
Supernova Remnant (Crab Nebula)
Binary Star System with an Accretion Disk
Periodic Table of Elements
Artist's rendition of a Black Hole
Supernova Remnants

Insterstellar Medium

Reflection Nebulae
The Trifid Nebula
Reflection Nebula in Orion
The Pleiades Star Cluster, and its Reflection Nebula
The Tarantula Nebula (Emission Nebula)
The Eagle Nebula
Hydrogen Gas in the Milky Way Galaxy
A Map of the Milky Way's spiral structure
Interstellar Dust Grains
Interplanetary Dust Grains
Identified Interstellar Molecules (NASA site)

The Center of the Milky Way Galaxy

Galaxies

Active Galactic Nuclei, Quasars

Cosmology