Finding “invisible” dwarf galaxies can help astronomers find the origin of the universe.
In the vast universe there are countless galaxies and the Earth we live in belongs to one of them.
In addition to the type visible to the eye and specialized instruments, there are also galaxies invisible in space – called dwarf galaxies.
Studying the galaxy promises to be very difficult, but if successful, it can provide valuable information to help us shape the formation and structure of this universe.
“Dwarf galaxies” – invisible galaxies
A dwarf galaxy is a small galaxy made up of several billion stars, a small number compared to the 200 to 400 billion stars in the Milky Way galaxy.
When you think of the Milky Way, you immediately think of a giant strip of light in space.
But dwarf galaxies are not, they are small and hard to see, sometimes just clusters of small stars.
Normally, the stars of a galaxy are enclosed in a space of dark matter. It is unidentified matter and occupies about a quarter of the universe which acts as a kind of “glue”, helping to bind galaxies in space.
Sometimes this bond becomes too strong, leading to a “collision” – merger – when several galaxies merge. Basically, it can be seen as a dwarf galaxy “eaten” by a larger galaxy.
In space, dwarf galaxies are extremely tiny. Dwarf galaxies can be isolated, but also play a role as satellites orbiting the large galaxy.
We can take the example of the Large Magellanic Cloud – a star cluster with more than 30 billion stars. It is a satellite cloud of the Milky Way galaxy, but it is sometimes classified as a dwarf galaxy.
The existence of dwarf galaxies plays an important role in cosmological research
Until now, all the theories about dwarf galaxies are only hypotheses, because before that, no dwarf galaxy had been “dissected” to study.
Scientists say predicting and speculating about a dwarf galaxy is simple, but verifying and studying them is extremely difficult.
Dwarf galaxies always know how to “hide” in the universe, because the stars of these dwarf galaxies do not have “enough” brightness.
However, if dwarf galaxies do not exist, then the whole dark matter hypothesis in outer space “will fall into the river into the sea”.
The most efficient method for determining dwarf galaxies today is to estimate the amount of dark matter surrounding stars. This amount of matter can be determined by the size of space affected by the gravity of dwarf galaxies.
The gravitational force of dwarf galaxies is determined to be so great that it can break a star’s path to light. It is the basis for the identification of dwarf galaxies.
The discovery of dwarf galaxies also has another contribution to cosmic research, which is the dark matter surrounding the galaxy. Dark matter is the deciding factor in the number and density of dwarf galaxies that exist in the universe.
Currently, there are two hypotheses about the properties of dark matter, which are heat and cold. Whether dark matter is hot or cold will greatly affect the makeup of the galaxy, the density of planets in stars and galaxies, and the rotational speed of the planet.
So far, the search for dwarf galaxies still faces many difficulties. But if scientists find positive results after doing their research, there is a lot of important information that can be used, which makes it possible to study the origin of the universe more quickly.