Phenomena

Why do we se, for example, a solar eclipse? Why do planets orbit around the Sun, which one is closer to it and which one is bigger? What is inside a telescope, what is the difference between a galaxy and a nebula?


Solar system
Galaxy
Black hole
Nebula
Constellation
Item
Telescope
GPS / Galileo navigation (GSA)
Apollo 11 Moon landing
Noon - time signal
International Astronomical Union
European South Observatory