The observable Universe is, of course, much larger. According to current thinking it is about 93 billion light years in diameter.
Moreover, how old is the universe in 2017?
This information helps astronomers determine the age of the universe. Age may only be a number, but when it comes to the age of the universe, it's a pretty important one. According to research, the universe is approximately 13.8 billion years old.
Astronomers think space might be infinite, with "stuff" (energy, galaxies, etc.) distributed pretty much the same as it is in the observable universe. If it is, that has some seriously weird implications for what lies out there. Beyond the Hubble Volume you won't just find more, different planets.
For years, astronomers were convinced that a structure known as the Sloan Great Wall was the biggest-known structure in the universe. This vast cluster of galaxies and other cosmic matter is a mind-boggling 1.4 billion light-years across.
It is about 9.5 trillion kilometres or 5.9 trillion miles. As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days).
The universe was already far too big to understand. But scientists just found that it's actually much bigger than we'd previously thought. The observable universe is made up of at least two trillion galaxies, according to a new study.
The radius of the observable universe is therefore estimated to be about 46.5 billion light-years and its diameter about 28.5 gigaparsecs (93 billion light-years, 8.8×1023 kilometres or 5.5×1023 miles).
According to the best estimates of astronomers there are at least one hundred billion galaxies in the observable universe. They've counted the galaxies in a particular region, and multiplied this up to estimate the number for the whole universe.
Universe with positive curvature. A positively curved universe is described by elliptic geometry, and can be thought of as a three-dimensional hypersphere, or some other spherical 3-manifold (such as the Poincaré dodecahedral space), all of which are quotients of the 3-sphere.
The Planck time is the time it would take a photon travelling at the speed of light to across a distance equal to the Planck length. This is the ï¿½quantum of timeï¿½, the smallest measurement of time that has any meaning, and is equal to 10-43 seconds. No smaller division of time has any meaning.
Our universe may be one of many, physicists say. The universe we live in may not be the only one out there. In fact, our universe could be just one of an infinite number of universes making up a "multiverse." Though the concept may stretch credulity, there's good physics behind it.
Putting the Size of the Observable Universe in Perspective. The age of the universe is about 13.75 billion years. The diameter of the observable universe is estimated at about 28 billion parsecs (93 billion light-years).
Saturn is the second largest planet in our Solar System. Only Jupiter is larger. Saturn is about 75 thousand miles (120,000 km) in diameter and is almost ten times the diameter of Earth. About 764 Earths could fit inside Saturn.
The radius of the Observable universe is estimated to be about 46 billion light years, which is about 2.7 × 10 23 miles. Note that the observable universe is just the part of the universe we can see. The universe itself is much larger than that, and it's even possible that it is infinite.
Why Do We Call Our Galaxy the Milky Way? The Romans named it via lactea precisely because it looks like a milky patch of sky above the Earth at night. But, the Romans weren't the first to name the galaxy. The Romans got the name from the Greeks, who called it galaxias kyklos, which translates into “milky circle.”
There are about 10 billion galaxies in the observable universe! The number of stars in a galaxy varies, but assuming an average of 100 billion stars per galaxy means that there are about 1,000,000,000,000,000,000,000 (that's 1 billion trillion) stars in the observable universe!
Edwin Hubble was the first to measure the expansion rate. The number he got was way wrong, so I won't bother mentioning it, but good on him for trying. The more modern value is 68 kilometers per second per megaparsec, plus or minus a couple, but close enough.
If inflation occurred at a constant rate through the life of the universe, that same spot is 46 billion light-years away today, making the diameter of the observable universe a sphere around 92 billion light-years. [
Astronomers like to call all material made up of protons, neutrons and electrons "baryonic matter". Until about thirty years ago, astronomers thought that the universe was composed almost entirely of this "baryonic matter", ordinary atoms.
The Great Attractor is an apparent gravitational anomaly in intergalactic space at the center of the local Laniakea Supercluster, in which the Milky Way is located, in the so-called Zone of Avoidance that is notoriously difficult to observe in visible wavelengths due to the obscuring effects of our own galactic plane.
Astronomers estimate 100 billion habitable Earth-like planets in the Milky Way, 50 sextillion in the universe. Astronomers at the University of Auckland claim that there are actually around 100 billion habitable, Earth-like planets in the Milky Way — significantly more than the previous estimate of around 17 billion.