Screensaver that shows a 3D random arbitrary solar system that shows planets with random orbits and textures from real solar system planets and imaginary planets around the sun. It's free of adware,ads,virus,etc... and it's freeware.

Educational orbit and gravitation simulator for high school, college and beginning university physics and astronomy. Easily create, run, print and save a simulation. Includes 29 introductory to advanced premade simulations with activities page in html-format. Uses actual pictures of planets. Plot orbits in a plane or in 3D. View time, distances, speeds, accelerations and energies as they change. Zoom and change parameters during the simulation.

Live interactive physics simulations let you explore the Solar System (orbits, seasons, gravity, tides, satellites and comets), play snooker (on a full size table) and experiment with Laws of Motion simulations. Now with machines ( pendulum clock and siege engines) bridge, crash and ideal gas simulations and experiments.

Integrated astronomy software suite exploring realistic skies in real time, with observing log, Sky Quiz, Live Orbits (orrery), telescope support, spoken pronunciation guidance, a half-million word Encyclopedia Astronomica, and concentrated searches embracing planets, comets, asteroids, DSOs, and up to 300,000 stars.

Experience accessible astronomy with a real-time sky, comprehensive reports, arcsecond accuracy, and exciting events such as animation and live tracking. Easy mouse-manipulation of the sky brings planets, comets, asteroids, DSOs, and a multitude of stars to your fingertips in real-time.
And let TimeLine graphically show the effects of precession down through the millennia...

Adastra Plus is a complete astronomy experience, with real-time sky, comprehensive reports, arcsecond accuracy, and exciting events such as animation and live orbital tracking. Two encyclopedic reference sources interactively link to the sky display, with planets, comets, asteroids, DSOs, and a multitude of stars. Let Sky Quiz quickly build familiarity with your local sky, as TimeLine shows the effects of precession through the millennia...