Mars
Nine Planets
MarsQuest - Rover Pictures
NASA - Mars Exploration
Google Mars
Mars Exploration Rovers - 2 Years on Mars
Athena - Mars Exploration Rovers

Solar System/Planets
Nine Planets
Simulator
NASA -Exploration

Galaxies/Milky Way
Galaxy Hunter
Galaxies Galore
Milky Way
Building the Milky Way
Galaxy Clusters

Constellations
The Constellations and Stars
The Constellation Table
Constellation Pictures
Mythology and Constellations
Enchanted Learning
The Royal Astronomical Society
Portraits of Stars and their Constellations
E-Sky

Comets/Meteroids/Asteroids
Making a Comet
The Comet's Tale
NASA - Genesis of a Comet
Label a Comet
Comet Pictures

Messages From Space
Signals
SETI
Very Large Array
Message Cluster

Cool Stuff
Space Slide Show
National Optical Astronomy Observatory
Amazing Space

V.4.MS.2 Describe, compare and explain the motions, planets, moons and comets in the solor system.
V.4.MS.3 Describe and explain common observations of the day and night skies.