What is the shape of the universe according to current observations?
Q: What is the shape of the universe according to current observations?
A: According to recent measurements, NASA has stated that the universe is flat with only a 0.4% margin of error.
Q: How does special relativity affect our understanding of the shape of the universe?
A: Due to the relativity of simultaneity, it is impossible to say whether two distinct events occur at the same time if those events are separated in space. This means that we cannot speak of different points in space as being "at the same point in time" nor, therefore, of "the shape of the universe at a point in time".
Q: What type of geometry do astrophysicists use when discussing the shape of the Universe?
A: Astrophysicists use Einsteinian relativity when discussing and testing models for describing and predicting aspects about the Universe. They also consider local geometry which relates especially to curvature and global geometry which relates to topology.
Q: Is every location in the Universe part of an observable universe?
A: Yes, every location in the Universe has its own observable universe which may or may not overlap with one centered on Earth.
Q: What is meant by 'flat' when referring to a model for describing/predicting aspects about The Universe?
A: Within one model, called FLRW (Friedmann-Lemaître-Robertson-Walker), 'flat' refers to an infinite flat model found to fit observational data best. It means that space appears uniform no matter where you look and there are no curves or bends present within this particular model.
Q: Are there other models that fit observational data besides FLRW's infinite flat model?
A: Yes, there are other models that also fit observational data besides FLRW's infinite flat model.
