A free app for Android, by RK Technologies.

This is an astronomy app that can help you pass your introductory astronomy course, whether you’re taking the course for credit or just for fun.

It has all the best astronomy questions you could possibly wish for, and you can access them by logging in with your Google account or through the login button on the main menu.

Some of the topics you can find in this app include:

The Solar System. The Universe. Observing the Sky. The Birth of Astronomy. The Earth. Moon, and Sky. Orbits and Gravity. Earth-like Planets. Comets and Asteroids. Debris of the Solar System. Cosmic Samples and the Origin of the Solar System. The Sun: A Garden-Variety Star. The Sun: A Nuclear Powerhouse. The Stars: A Celestial Census. The Milky Way Galaxy. Galaxies. Active Galaxies, Quasars, and Supermassive Black Holes. The Birth of Stars and the Discovery of Planets outside the Solar System.