About
PX stands for Parallax
Move your head and the world shifts. Astronomers used that trick to measure the distance to the stars. We use it to look at the biggest questions from angles you didn't expect.
Try it
Hold a finger in front of your face. Close your left eye, then your right. Your finger jumps; the wall behind it doesn't. Nothing moved except where you were looking from.
Astronomers do the same with the whole Earth. They look at a nearby star in January and again in July, from opposite sides of Earth's orbit, and watch it shift against stars much farther away. The smaller the shift, the farther away the star.
Watch Earth go around the Sun, or drag the slider to move it yourself.
Your guide
Meet Dr. PX
Dr. PX is the stick-figure scientist who hosts every video: round glasses, dark hair, easily amazed, never makes things up. When something truly surprises him, he grabs his head. That's his “mind blown”.
Dr. PX is a cartoon, and the narration is a synthetic voice. Each video's credits say so.
How we research
“Every fact is checked, every source is listed.”
Every claim gets a source
Each fact in a script is traced to a primary or reputable source: space agencies, research papers, museums, science journalists. Every video has its own page here with those sources, grouped by claim.
Specific, never vague
Names, dates, places and numbers. Not “scientists say”.
Uncertainty, said out loud
When something is “not proof” or “we don't know yet”, the video says exactly that.
Real pictures for real things
Real objects, places and events are shown with real, licensed photos (public domain or Creative Commons). Cartoons are for ideas. No AI “photos” of real events.
Credits for everything
Photos, music and licences are listed on each video page, and the synthetic narration voice is disclosed.
Found something we got wrong? Tell Dr. PX or say so in the comments under the video. See every video's sources →
FAQ
Questions people ask
What does PX mean?
PX stands for Parallax: move your head and the world shifts. Astronomers used that trick to measure the distance to the stars. We use it to look at the biggest questions from angles you didn't expect.
Who is Dr. PX?
Dr. PX is the stick-figure scientist who hosts every video: round glasses, dark hair, easily amazed, never makes things up. He's a cartoon.
Is there a real person behind Dr. PX?
Yes. Dr. PX is a cartoon, but behind him is a real person who works tirelessly on every video: digging deep into the research, tackling the hardest questions, and using his skill to turn them into something simple, clear and fun to watch. Each video takes hundreds of hours to finish.
How does PXReality check its facts?
Each fact in a script is traced to a primary or reputable source: space agencies, research papers, museums, science journalists. Every video has its own page on PXReality.com with those sources, grouped by claim.
Is the narrator a real person?
No. The narration is a synthetic (AI-generated) voice, and each video's credits say so.
Who are the videos for?
A general audience, 13 and up: anyone curious about space and science mysteries.
How can I suggest a mystery or report a mistake?
Use the Ask Dr. PX form at pxreality.com/contact, or email mission-control@pxreality.com.