One hypothesis about the shape of the universe is that the universe is in the space of Euclidean geometry and flat. In Euclidean geometry, it is assumed that straight lines extend everywhere, planes ...

A: The short answer is gravity. This ‘force’, by virtue of the large masses of planets and stars, forces them into a spherical shape. Part of the answer is also geometry: a sphere is the most compact ...

Celestial bodies are spherical in shape because of gravity. Celestial bodies are spherical in shape because of gravity. Whenever enough mass gathers close together, the resultant gravity, which ...

When the Earth formed 4.6 billion years ago, it was composed of molten material that gravity pulled into a spherical shape, which solidified as the planet cooled. Some objects in the solar system are ...