This diagram shows our cosmic address at a glance. We see our planetary system around the Sun, our stellar neighborhood in our galaxy, our galaxy in the local group of galaxies, and our group in the entire universe. The universe is big
Other than a handful of deep sky objects (galaxies, nebulas, star clusters) that can be seen w/ the naked eye, this statement is basically correct. The stars we can see do generally fit inside that circle.
PHD Comics: Gravitational Waves Explained Simple explanation but really interesting for further understanding on gravitational waves. "That's one small step for man, one giant leap for mankind" Neil Armstrong quote Mehr
Even science doesn't know it all. Knowledge increases, even when there are established "facts". <- science is a tool that allows us to know more about our universe, but unfortunately our knowledge is restricted to the technology and knowledge we can use.
Our magnetic field protects us from blasts of solar radiation & likely existed soon after the planet formed. This may explain why Earth is habitable & Mars is not. Without our magnetic field, solar winds would strip away Earth's atmosphere & oceans.