Event Horizon
The event horizon is like an invisible boundary around a black hole - it's the "point of no return!" Once anything crosses this line, it can never come back out.
Think of it like a cosmic waterfall. If you're in a boat and you go over the edge of a waterfall, you can't paddle back up. The event horizon works the same way with gravity!
The event horizon isn't a solid surface you can see or touch. It's more like an invisible line in space that marks where the black hole's gravity becomes too strong to escape from.
Fun Fact!
The event horizon of a black hole made from our Sun would be only about 6 kilometers (3.7 miles) across!
Spot the Invisible Black Hole 🕵️♂️
Watch the stars and find the invisible black hole!
Detective Mission
One star is orbiting around an invisible black hole. Click where you think the black hole is!
Click where you think the black hole is!
Look for the star that's moving in a circle
💡 Detective Tip: Black holes are invisible, but their gravity makes nearby stars orbit around them!