Dark Ages Light always travels at the same speed, in every direction . light always travels at the same speed, in every direction. astronomers know the universe is infinite in size. Therefore, the observable universe is a spherical volume centered on the observer. The universe is a seemingly endless sea filled with stars, galaxies, and nebulae. The observable universe is a spherical region of the Universe comprising all matter that can be observed from Earth at the present time. In this case, the universe is closed and finite, though it has no end, and has a spherical shape. Illustration by S. Larson. We can see this part of the universe because light from these objects has had time to reach Earth. The baryonic matter density at this time is about 500 million hydrogen and helium atoms per m 3, approximately a billion times higher than today.
The observable universe is spherical because Choose one: A. light always travels at the same speed, in every direction. Some justification would be required for the assumption that this black hole had the same radius as the radius of the observable universe. The shape of the universe depends on its density. The observable universe is a 3D surface of a 4D entity, space-time. "What we call the "observable universe" (or the "Hubble Volume") is the spherical region, about 90 billion light-years in diameter, that is centered on any given observer. This is the only part of the universe in which light has had time to reach the observer in the 13.8 billion years since the universe … The observable universe is not a volume of 3D space, even if we perceive it as such.
That is, the observable universe has a spherical volume (a ball) centered on the observer. the observable universe is spherical because. We are only able to detect the light from as far back as the time of photon decoupling in the recombination epoch that the photons can be emitted from particles and cannot be quickly absorbed again by other particles. There are two kinds of curvature that we could talk about: intrinsic and extrinsic. If the density is more than the critical density, the universe is closed and curves like a sphere; if less, it will curve like a saddle.
B. the universe is expanding outward from the Big Bang. The observable universe. $\endgroup$ – user4552 Aug 24 '14 at 18:42 ... we cannot tell where we lie in the enormous span of the universe.
In it, we see patterns and constellations that have inspired stories throughout history. This density corresponds to pressure on the order of 10 −17 atm. B. the universe is expanding outward from the Big Bang. The observable Universe is a spherical region of the Universe, including all substances that can be observed from the Ground or space telescopes and research probes at the present time, because the electromagnetic radiation from these objects had enough time to get to the Solar system and Earth from the beginning of the cosmological expansion. false. Cosmologists distinguish between the observable universe and the entire universe, the former being a spherical portion of the latter that can, in principle, be accessible by astronomical observations. all the light from all directions has had the same amount of time to get here. Once the universe stops expanding, it will begin to contract.
The Observable Universe is a spherical region of the Universe consisting of all matter than can be observed from Earth at the current time, because electromagnetic radiation from these objects has had time to reach Earth's region in space since the Big Bang. When people talk about the universe being curved or flat, open or closed, etc, they’re talking about intrinsic curvature, or lack thereof.