• There is no center of the universe. You are the center of the observable universe.
• We put a man on the Moon before we managed to put wheels on suitcases.
• Venus is believed to have been a near-exact twin of Earth billions of years ago.
• If you unraveled and stretched all the DNA from a single human body into a single line, it would reach Pluto and back - five times.
• Theoretically, if we placed a mirror 0.5 light-years away aimed at Earth and looked into it through a telescope, we would see events from exactly one year ago in "real time." (And no, it would not break the universe with an infinite loop).
• Every planet in our solar system could fit in the space between Earth and the Moon, with roughly 8,000 kilometers of empty space to spare.
• We can routinely observe Andromeda, our "neighboring" galaxy, from Earth. The fascinating part is that Andromeda actually covers more area in the night sky than the Moon - it is simply too faint to see with the naked eye.
• Many people already know that if the Sun suddenly vanished, we would still have its light for 8 minutes. The more intriguing fact is that we would also retain its gravity for those 8 minutes. The speed of light is not just about light itself; it is the absolute maximum speed at which one thing can influence another - gravity included.
• As far as we know, Mars is the only planet populated entirely by robots. Venus, by contrast, is a robotic graveyard.
• If you place a grain of sand on the tip of your finger and hold it up against the sky, the area hidden behind that grain contains ten thousand galaxies. Not stars. Galaxies. And that is only what humanity has managed to observe so far. In all likelihood, billions more lie beyond the reach of our current optics.
• We live in the golden age of the universe. It is old enough for life to arise, yet young enough that we can still observe neighboring galaxies. In the distant future, other galaxies will no longer be visible because space will expand faster than the speed of light. Advanced future civilizations will have absolutely no idea that other galaxies ever existed.