1: If you take every single human on Earth and you put one on top of another, the total height will be 8 times the diameter of sun
2: Venus actually had liquid when the Sun was young, but as it gets older, more hotter it gets. The rise of Sun's temperature let Venus's volcanoes to erupt and all the gaz released by these raging volcanoes now becomes Venus's atmosphere.
3: One of the ways to make Mars habitable is to pollute its atmosphere by rising green house effect (which human seems to be very good at)
4: Astronomers recently found a giant equilateral hexagon on the north pole of Saturn. That hexagon is a vortex called "The Great White Spot". This vortex is even bigger than Jupiter's Great Red Spot
5: If all the plants on Earth die, the oxygen contained in our atmosphere can let us breathe for about 1000 years.
If you want more facts, let me know in the comments