Scientists hypothesized that the mass extinction of dinosaurs was associated not with the fall of the meteorite to Earth, but with the passage of the solar system through a molecular cloud.
When it comes to the cosmic threat, something massive is always coming to mind. A huge stone lump from another galaxy, a black hole, an invasion of aliens. But it may very well be that the cause of the new extinction of species on Earth will be something quiet and inconspicuous, not falling with a noise on the planet and not shooting blasters.
Japanese scientist Tokuhiro Nimura suggested that the cause of extinction of dinosaurs could not be an asteroid, but a molecular cloud that enveloped the Earth. It was because of him that the Earth plunged into the twilight, and its temperature dropped noticeably. In addition, with this hypothesis, a large number of iridium is consistent in the geological strata of that era – it could also have reached the Earth from the cloud.
Mel-tertiary extinction, after which dinosaurs disappeared from our planet – not the only mass extinction of species. Similar events occur approximately every 26-27 million years. Such periodicity forces scientists to search for space objects that could become the cause of extinction.
The most popular candidates for the role of “killer species” are the red dwarf Nemesis, hypothetically rotating at a distance of 1.5 light years from the Sun, and the mysterious planet X somewhere on the outskirts of the solar system. But there are too many inconsistencies in these theories. Perhaps the hypothesis of molecular clouds, through which our planet periodically passes, will be more prosperous.