Jakarta –
Not only galaxy The Milky Way, the number of galaxies in the universe turns out to be hundreds of billions. Before discussing it further, let’s first find out what a galaxy is.
Launching Space Place belonging to the National Aeronautics and Space Administration (NASA) in short, a galaxy is a huge collection of gas, dust and billions of stars and their solar systems that are held together by gravity.
Detikers currently lives on planet Earth which is located in the Milky Way. The Milky Way galaxy has a spiral shape.
However, many other galaxies are not exactly the same, some are curved, oval and even irregular so that they look like lumps. Even so, astronomers classify galaxies into three main categories: elliptical, spiral, and irregular.
Galaxy Elliptical shapes are the most commonly observed galaxies. The amount is almost a third of the total observations. Scattered elliptical galaxies are called giant ellipticals and are about 300,000 light years old.
While spiral galaxies have the shape of disks of stars which are eventually divided into two groups namely normal spirals and barred spirals. It’s called a barred spiral because you see star bars protruding from the center of the galaxy. Spiral slatted arms usually start at the end of the bar rather than a ledge.
Finally, regular galaxies have less dust than usually found in the early universe, because they have not yet developed.
Since there are billions of them, one galaxy and another can collide if they get too close. The closest galaxy to the Milky Way is called the Andromeda Galaxy. Even though they are close, NASA explains that it will take at least five billion years for the two to collide.
The process of formation of galaxies
Reported by NASA’s Hubblesite page, astronomer Edwin Hubble explained that the universe could be expanding. Scientists estimate the age of the universe to be 13.8 billion light years after the event big Bang.
One data shows when different galaxies formed in the last billion years or what is called cosmic terms.
The early universe was filled with hydrogen, helium, and various dark matter, and some areas were denser than others. These dense areas can collapse over time.
When it collapses, the hydrogen and helium build up into clumps of dark matter that can whirl through space. Until finally stars and galaxies made up of gas, dust and stars formed the first galaxy.
Hubble admits he never saw the first galaxy. But according to him, he can follow the development of the galaxy during most of the cosmic time.
Current number of all galaxies in the universe
Figuring out how many total galaxies there are in the universe is quite difficult. Launching The Conversation’s page, it is claimed that many galaxies are too faint and small to be easily observed.
But astronomers managed to point the Hubble Space Telescope at a small patch of sky for 11.3 days and load data on galaxies from closest to farthest away. As a result, that tiny speck is filled with nearly 10,000 galaxies of all shapes and sizes.
From this data, astronomers multiply this number over several other celestial spheres throughout the universe and derive estimates that there are currently 100 to 200 billion galaxy available.
It doesn’t stop there, this number will continue to change as time passes and universe research is done in the future. Amazing non detiker!
Watch a video “Scientists reveal exciting discoveries about stars in the Milky Way galaxy“
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