Voyager probe near Saturn, with shadow of Saturn on the rings.

Voyager 2 at Saturn Aug. 26, 1981. Credit: NASA Eyes on the Solar System / Bob Trembley

NASA Eyes on the Solar System:
Free app for Windows and MAC OS X – travel along with current space missions, go to planets, moon, and asteroids, see Earth climate data, and exoplanet systems.

Earth in Space, Credit: Space Engine / Bob Trembley

Space Engine:
A FREE virtual Universe you can explore on your computer. You can travel from star to star, from galaxy to galaxy, landing on any planet, moon, or asteroid with the ability to explore its alien landscape. You can alter the speed of time and observe any celestial phenomena you please.

Sol -vs- TRAPPIST-1 -vs- Jupiter. Credit: Universe Sandbox ² / Bob Trembley

Universe Sandbox
A physics-based space simulator that merges gravity, climate, collision, and material interactions to reveal the beauty of our universe and the fragility of our planet.

Create, destroy, and interact on a scale you’ve never before imagined.

Orion and Taurus with artwork. Credit: Stellarium

Stellarium is a free planetarium app; you can see the skies from any location on Earth, at any date and time you wish. You can turn on constellation lines and artwork, control your telescope, and much more!

For more simulation apps, see these posts on the Catholic Astronomer:
Space Visualization Software
Kerbal Space Program


Reason-Faith-Science by Bishop Robert Barron (videos, posters, and other material, especially for teachers).

Introductory Astronomy by Robert Nemiroff of the Astronomy Picture of the Day.

Astronomy for Everyone – a video series made by the Ford Amateur Astronomy Club.