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. astronomers know the universe is infinite in size. all the light from all directions has had the same amount of time to get here. The universe is a seemingly endless sea filled with stars, galaxies, and nebulae. the observable universe is spherical because. Once the universe stops expanding, it will begin to contract. Observable universe. D. the universe is expanding outward from the Big Bang. between 0 and 1, there are an infinite number of numbers. When people talk about the universe being curved or flat, open or closed, etc, they’re talking about intrinsic curvature, or lack thereof. C. a sphere is the most symmetric shape. false. In it, we see patterns and constellations that have inspired stories throughout history. There are two kinds of curvature that we could talk about: intrinsic and extrinsic. Light always travels at the same speed, in every direction . The observable universe. 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. light always travels at the same speed, in every direction. B. the entire universe is expanding away from the Milky Way. Just because we cannot see land does not ... this would be the case in a closed spherical universe. This density corresponds to pressure on the order of 10 −17 atm. Assuming the Universe is isotropic, the distance to the edge of the observable universe is roughly the same in every direction. we appear to be at the center of the observable universe because . In this case, the universe is closed and finite, though it has no end, and has a spherical shape. Dark Ages The observable universe is a 3D surface of a 4D entity, space-time. B. the universe is expanding outward from the Big Bang. The observable universe is a spherical region of the Universe comprising all matter that can be observed from Earth at the present time. $\endgroup$ – user4552 Aug 24 '14 at 18:42 That is, the observable universe has a spherical volume (a ball) centered on the observer. 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. Some justification would be required for the assumption that this black hole had the same radius as the radius of the observable universe. 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. The observable universe is spherical because A. light always travels at the same speed, in every direction. ... we cannot tell where we lie in the enormous span of the universe. We can see this part of the universe because light from these objects has had time to reach Earth. There are at least 2 trillion galaxies in the observable universe. 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. The spherical volume of space which will become the observable universe is 42 million light-years in radius at this time. The observable universe is not a volume of 3D space, even if we perceive it as such. The shape of the universe depends on its density. Therefore, the observable universe is a spherical volume centered on the observer. The observable universe is spherical because Choose one: A. light always travels at the same speed, in every direction. Illustration by S. Larson. The observable universe is spherical because A. light always travels at the same speed, in every direction. 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 baryonic matter density at this time is about 500 million hydrogen and helium atoms per m 3, approximately a billion times higher than today. "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. B. the universe is expanding outward from the Big Bang. Nearly all of the possible microstates for this spherical region of space are ones in which all its matter is in a single black hole.
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