This quiz is as hard as the diamond rain on Neptune — see if you can do better than the average Earthling!
How did you go? Our solar system is just one of many orbiting around 250 billion stars in the Milky Way galaxy.
And our home galaxy is just one of billions. That's just mind-bending!
To hear more about our amazing cosmos, subscribe to our podcast Cosmic Vertigo.
Or catch up with Stargazing Live on iView.
