Scientists have discovered three new extremely dim dwarf galaxies that have never been seen before. They are very small and far from larger galaxies. However, they contain only a few hundred thousand old stars and do not contain the interstellar gas necessary to create new stars.. This means that some event in the early Universe led to the suppression of star formation in these dwarf galaxies. The study was published by The Astrophysical Journal Letters, writes IFLScience.

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While the Milky Way and similar large galaxies contain hundreds of billions of stars of varying ages, three new very faint dwarf galaxies contain only a few hundred thousand old stars. This means that very long ago in the early Universe, something stopped the process of the formation of new stars and removed the interstellar gas necessary for their formation.

Three new dwarf galaxies, which belong to the type of the faintest and therefore hard to detect galaxies, are located in the constellation Sculptor and are named Sculptor A, Sculptor B and Sculptor C.

All three galaxies are millions of light years away, but no larger neighbors have been discovered near them.. And this is a problem when it comes to explaining why these galaxies stopped creating new stars long ago in the early Universe.

Such small galaxies cannot retain the interstellar gas necessary for star formation if a large galaxy is nearby. That is, if they are satellites of the latter. The large galaxy's gravity will continually pull this valuable gas out of the dwarf galaxies, stopping the process of new star formation.. But the discovered galaxies, as mentioned above, are located in an isolated area of \u200b\u200bspace.

Astronomers have called these galaxies cosmic ghost towns that are difficult to explain, but there is still some speculation about why there are no new stars in them.

Scientists suggest that the reason may be a period in the history of the early Universe, such as the era of reionization. Several hundred million years after the Big Bang, intense radiation from the very first stars filled space and caused hydrogen gas to evaporate in the smallest galaxies.. And this hydrogen was supposed to be the main ingredient for creating new stars.

Another hypothesis suggests that some of the very first stars in dwarf galaxies exploded in extremely powerful supernovae.. Thus, the radiation from this explosion could push interstellar gas out of galaxies.

To better understand what happened to these three galaxies, we need to find more similar objects in isolated areas of space, scientists say. After all, previously extremely dim dwarf galaxies were found only near the Milky Way.

As Focus already wrote, astronomers have discovered a completely new type of planets that are not similar to worlds in the solar system. Study finds one of the most common types of planets is super-Venus.

Focus also wrote that astronomers have discovered the origin of the Earth’s temporary satellite, which orbited our planet for just a couple of months.