An online virtual reality universe that has grown to involve hundreds
of thousands of users with over 1000 unique worlds.
Included in this VR universe is a whole Mars world with spaceports and
"Originally designed in 1997 as a demo project for NASA, the virtual
world Mars has been open for colonization by Active Worlds' residents
since 1998; and is one of the more popular hang outs for adventurous
humans and extra-terrestrials alike." - Mars tour homepage.
AstroArts - Online
Simulators AstroArts is a Japanese site with
lots of astronomy related information, links and resources. This page
includes several astronomy programs including sunrise/sunset calculator,
Moon calendar, Planisphere and Orbit viewers for comets & asteroids.
- Solar System
The BBC Online offers a large and sophisticated space
site concerning the planets and general space exploration related
Observatory - NASA
Very nice educational site about earth observation. The Observation Deck
section allows you to build animations showing changes on the earth
as since from space over long periods. For example, look at the changes
York Times - Exploring the Solar System
These pages at the NYT (free registration to NYT site required) provide
lots of info about the planets, the Sun and other components of our solar
system. Including are some interactive programs (download of a plug-in
needed) that display:
National Geographic Interactive Space
Virtual Solar System - 3-D views in a "fly-by tour of the
sun and each planet in its orbit, observe close-up views of the planets,
extraterrestrial weather patterns, and more."
to Mars : Numerous 3-D panorama simulations of the Mars Pathfinder
mission to Mars.
Far Is It
This program calculates the distance between any two cities
Moon applets/ programs
of the Moon - Were you born under a full moon?
Will your next camping trip have a moonless sky to
see the stars at their brightest? Use this program
from the US Navy to see the phase of the moon for
any day between 1800-2199 AD.
Tracking - Java program to give current azimuth
& elevation of the Moon for a given location.
created by Alan Eliasen. At the simplest level it
just does unit conversion but, as these sample
calculations show, it can do an amazing range
of calculations with one or a few lines of code.
It "is optimized for doing quick, off-the-cuff
calculations with a minimum of typing".
the Periodic Table
The NASA Genesis
Mission collected particles from the solar wind and
returned them to earth. To practice analysis of the chemical
composition of the samples, they offered this online program.
of Ten - neat Java program that shows how a few
factors of ten can take you from the atom out to the
edges of the galaxy.
range calculator online program by Eric Johnston
Seti that calculates the range of the radio signals
that might be sent by extraterrestrials based on the
size of the transmission dish, power, frequency, and
(previously GSOC Satellite Predictions)
Online Program at German Space Observation Centre is an excellent and easy
to use source to obtain the latest information on satellites passing over
your location tonight. After providing the program with your location for
the first time, you should bookmark the page. The bookmark will then include
your location so that clicking on the bookmark will automatically give the
satellite data for your position.
This company builds "state-of-the-art Satellite Telemetry Monitoring &
Commanding Systems (TM/TC)". Their SatView™ package has been used for
many space projects including Artemis, MARECS-A, ITALSAT-2, etc.
They now offer a real-time satellite tracking plug-in based on
Microsoft® Silverlight® 4 that you can check it out for free here.
With an easy to use drag-and-drop interface, you select from a big library
of spacecraft to track their current locations and to obtain future orbits.
They write, It has been developed solely for 'space enthusiasts' and is
not intended for use by professionals.They are asking for input on the
program including suggestions for what orbit prediction services they
CelesTrak - T. S. Kelso's
two line element online resources.