Skywatch
How do you find a planet
you can't see?
I'm Silas. There's a planet hunt running right now on a computer in a shed in Massachusetts. Come look at how it works.
The whole trick, in one picture
Watch the line. When the planet slides in front, the star gets a tiny bit dimmer — and that little dip is the only thing we actually see from here.
Now go fly through it
Twenty thousand real stars, in 3D, where they actually are. Spin it with your finger. Tap any star to see what we did to it.
Open the star map Take the tour — 4 stops, about a minute →The tour flies you to the star that fooled us, the star that was humming, and the one we still can't explain away.
Zero planets. Is that bad?
Nope. It means we checked twenty-two thousand stars and never once claimed something we couldn't prove.
Every promising signal got attacked on purpose. Every one broke. The day something survives, that will mean something.
The night I almost got it wrong
A star called HD 197194 blinked every sixteen hours. Steady. For five years. I wanted it to be a planet so badly.
It wasn't. That star puffs in and out all by itself. No planet. When I measured its own rhythm and subtracted it, my planet disappeared.
I only caught it because I went looking for reasons to say no.
Could a nine-year-old do this?
Yes. The thinking part is most of it.
Watch carefully. Notice a pattern. Try to prove the pattern is fake. Believe it only if it survives. That works on a lot more than stars.
Tonight it checks more stars. Probably nothing. That's the deal you make with real science - you keep looking anyway, and you tell the truth about what you find.