How do we know the world is infinite?

Our best observations to date strongly suggest that the universe has no spatial curvature. It may be expanding in time, but the geometry of space, at any given time, is Euclidean. The simplest topology that corresponds to Euclidean geometry is that of flat, infinite space.

Is it confirmed that the universe will end?

22 billion years in the future is the earliest possible end of the Universe in the Big Rip scenario, assuming a model of dark energy with w = −1.5. False vacuum decay may occur in 20 to 30 billion years if Higgs boson field is metastable.

Why time machine is not possible?

One significant limitation of such a time machine is that it is only possible to go as far back in time as the initial creation of the machine; in essence, it is more of a path through time than it is a device that itself moves through time, and it would not allow the technology itself to be moved backward in time.

Is the universe infinite or finite?

Because space isn’t curved they will never meet or drift away from each other. A flat universe could be infinite: imagine a 2D piece of paper that stretches out forever. But it could also be finite: imagine taking a piece of paper, making a cylinder and joining the ends to make a torus (doughnut) shape.

Is there an “outside” universe?

This suggests that there is an “outside” to the universe, as though one could theoretically step outside and then observe from outside the system. However, we have no evidence to suggest that such an “outside” exists, which makes a strong case for the infinite universe theory. Could It Be Infinite?

Is there a definitive answer to everything in the universe?

Scientists and academics like firm answers and measurable quantities, but when you’re talking about the largest conceivable scale (the entirety of the universe), such definitive answers are often elusive, or impossible to ever prove.

How big is the observable universe?

The observable universe is still huge, but it has limits. That’s because we know the universe isn’t infinitely old — we know the Big Bang occurred some 13.8 billion years ago. That means that light has had “only” 13.8 billion years to travel.