Is the universe infinite

artiteacher The critical density of space

artiteacher Shape of the universe

The cosmos stretches out flat! (Oh, so flat!) / Parallel lines never bend! (No, never bend!)

artiteacher Measuring cosmic lines with triangles

artiteacher The amount of matter and energy determines whether gravity will bend space.

artiteacher Scientists use giant triangles across the cosmos to test if space is curved.

BETA

artiteacher Pocket Infinity

Fun Fact

Cosmic flatness: The Planck satellite measured the universe's curvature and found it is flat to within a margin of error of just 1%.

Glossary

curvature (noun)
The degree to which a geometric object, such as a curve or a surface, deviates from being flat. In 2013, the Planck satellite analyzed cosmic microwave background radiation to measure the universe's overall curvature.

Gossip

Which shape of the universe sounds the most comforting?

Quiz

What shape is space if its geometry is described as 'open'?

artiteacher Three possible shapes of the cosmos

Quiz

Which space telescope provided the most precise measurements of cosmic flatness?

artiteacher The torus and wrap-around universes

Quiz

What math branch studies wrap-around shapes like a three-dimensional doughnut?

Quiz

What happens to parallel light beams traveling through a closed, spherical universe?

Quiz

Which force is primarily responsible for bending the geometry of space-time?

Quiz

If the universe is flat and infinite, how many stars could theoretically exist?

Quiz

What is the critical density of the universe equivalent to per cubic meter?

Quiz

If you draw a triangle in a flat universe, what do the angles add up to?