What is the shape of our "spacetime" if we are in a curved universe?

 Space has no shape, it's just a thin soup of neutral hydrogen elements and gasses with passing alpa and beta particals, all moved by a very strong and fast wind.

Time is not as what most think, and a somthing we can't stop, cant speed up, cant slow down, time is the chain reactions of natural events all around us, somthing we can't control but can use to work things out, a math tool only.

We age as we decay, we dont time unless we plan somthing, or work out a trip.

Now the Universal shape, & not what you would expect, with many thinking our Universe is I side a giant bubble, they were correct, and not just one.

In the biggest plasmoid chain you could imagen, we sit with a new younger bubble that our universal made, and past the far Arrowhead void, the entrance to a 9.2 Gy Old bubble just smaller than our own,& this also has its own new bubble with a younger age of 4 to 5 billion years old

Opposit is a much larger bu ble within age of 18 billion years old, with a high possibility of an older attachment past 22 billion years old to us.

This plasmoid Chain is somthing we see from every binary star, every planet in a strong solar or cosmic wind, and is found around almost every large object in space, even around a neuteon star.

Did we know the shape of the continents before satellites?

 Here’s a 1950 map of Earth, 7 years before Sputnik launched:

Here’s a 1900AD map of Earth, 57 years before Sputnik:

And a 1900 globe projection of Earth:

And an 1850 map of Earth. It’s getting a bit rougher at the north and south poles, which were barely explored at the time.

An 1852 map:

A 1798 map of the world: not much worse than 1850.

By 1750, there were some real blanks at the far edges of the world from Europe:

1700 map - not much worse than 1750, allowing for the limits of the projection.

1630 map - missing a certain land down under:

1570: definitely some room for improvement, but the cartographer’s heart (and continents) are in the right places.

1502: a few holes here and there, but it was up to date with European explorations.

Short answer: yes, we figured out the shape of continents before satellites.