Australian scientists have published their article in the journal BioScience, summarized by Naked Science. The authors explained that alien organisms can accidentally get to Earth along with spacecraft. If an invasive organism takes root here, then it can cause great harm to the planet and those who inhabit it.
The researchers also reported on the second scenario: if the terrestrial microorganisms visit space, and then return back. This can happen when using spaceships. Scientists warn that bacteria mutate much faster in space and can become more resistant. In this form, they will be dangerous on Earth.
Scientists urge to attract specialists to develop protective measures.