# How tall is the universe?

1. Jan 26, 2006

### jhe1984

As the question hints at, how tall is the universe?

I know it is thought to be flat, but what is its height?

Furthermore, are there regions that are taller than others?

Thanks

2. Jan 26, 2006

### mijoon

"Flat" refers to its geometric properties not its physical shape.

3. Jan 26, 2006

### jhe1984

Hmm - not sure I follow. By geometrically "flat" do you mean that any two regions have the same geometric properties, everything else being equal?

Back to the question, isn't there a tallest and lowest point (relative to Earth, I guess) and wouldn't you be able to measure height along these lines?

4. Jan 27, 2006

### SpaceTiger

Staff Emeritus
5. Jan 27, 2006

### mijoon

I could not explain it better than Space Tiger did. "Flat" does not mean that the universe is shaped like a large disk. "Flat" means that the geometric properties (such as the sum of the angles equaling 180) are Euclidian.

6. Jan 27, 2006

### jhe1984

Cool. Thanks yall