What kind of creatures might live on other planets? Are they similar to human life or do they have quite different, unexpected forms?
Learning more and more about our universe, scientists begin to speculate about what the aliens from outer space might look like. Here are some of the theories put forward by researchers about a possible look of the extraterrestrial creatures.
1. Huge jellyfish
British researcher Dr. Maggie Aderin-Pocock, believes that aliens may be marine animals that use light pulses to communicate with each other.
Their body extends from the sunlight, and they are covered with a metal surface for the absorption of light. For growth and reproduction, they absorb chemicals from the atmosphere. Lenses help them explore their surroundings. The lower part of their body is colored orange for masking, and special bags allow them to flow in the air.
The scientist has built her theory on the fact that life on our planet emerged in the oceans. She came to the conclusion that the extraterrestrial beings could interact with the atmosphere on other planets, as well as organisms in the oceans interact with the water.
Cockroaches are among the most persistent creatures on the planet. Due to the thick exoskeleton they can survive in a variety of extreme conditions, including a nuclear explosion.
The life forms similar to those of insects are the most likely candidates for the role of alien beings, given the diversity of habitats in the universe.
3. Human-like aliens
British paleontologist Simon Conway Morris believes that if extraterrestrial life exists, we need to be wary of it.
He put forward the theory that aliens are likely to look like humans, not only on the outside and from the biological point of view, but also from the standpoint of having the same defects, such as greed, aggressiveness and tendency to use the resources of others.
As explained by the scientist, evolution is quite predictable, and the biosphere on other planets should lead to the same intelligent beings with ever-growing need for resources.
4. Non-carbon life form
Most life forms found on our planet consist of carbon, hydrogen, nitrogen, oxygen, phosphorus and sulfur. However, in 2010, scientists found organisms that do not require oxygen.
This caused some discussions relating to how we envision life and what it can be like.
There are scientific hypotheses, according to which except for non-carbon life forms there are silicon ones in the universe. Silicon is just below carbon in the periodic table, has similar chemical properties and is widely distributed in the universe.
If so, the aliens are unlikely to have anything to do with what we see on our planet.
Only within the Milky Way there are 60 billion planets where extra-terrestrial life might exist and take fantastic shapes.
Astrobiologist Dr. Lewis Dartnell from University College London has put forward a few suggestions of what the aliens on planets other than our own might be like.
On planets covered with huge oceans, there might exist aquatic creatures like those that dwell in the depths of our oceans.
On a planet with strong gravity and dense atmosphere large, strong and aggressive flying creatures might live. On ice planets only the bacteria could probably survive and come together in a giant network.