Some creatures should stay at home

Article Abstract:

The introduction by humans of animals and plants to parts of the world where these species have not previously existed has become the second most important cause of species loss. Alien animals and plants often have a very negative impact on native species, with biodiversity suffering as a result. Sometimes, a species introduced to destroy a pest becomes a pest itself. In other cases, introduced species simply breed more successfully than native species.

Environmental aspects, Animal introduction, Plant introduction

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Aliens are found in space. Now all that is needed is some proof

Article Abstract:

Signs of life have been discovered 41 kilometers above the surface of the Earth, well above the 16 kilometers reached by air. If microbes can survive without air this strengthens the theory that they could travel between planets.

Research, Life on other planets, Extraterrestrial life, Microbial respiration

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