Stargaze from the web browser with an open source planetarium
Stellarium is a free, open source planetarium software for every OS. It's an amazing 3D simulation of the night sky that lets you explore and observe stars, constellations, planets, and other celestial objects. What's really cool about it is that it has a comprehensive database of stars, nebulae, galaxies, and so much more. Also, the software allows you to view the sky from any location on Earth at any time in the past or future, so you can look at a future night sky your descendants may see. Stellarium also includes advanced features such as telescopic controls and the ability to track the motion of celestial objects. Amateur astronomers and educators use Stellarium to explore the sky, and it is considered one of the best planetarium programs available.