Is there life on Mars?
Life on Mars
1. The possibility of life on Mars is a subject of interest in astrobiology due to its proximity and similarities to Earth. To date, no proof of past or present life has been found on Mars.
2. Mars is of particular interest for the study of the origins of life because of its similarity to the early Earth.
3. Currently, the surface of Mars is bathed with ionizing radiation, and Martian soil is rich in perchlorates toxic to microorganisms. So there is very little probability to have a life on Mars.
4. NASA Mars 2020 rover Perseverance, having landed successfully, will cache dozens of drill samples for their potential transport to Earth laboratories in the late 2020s or 2030s.
5. The surface of Mars today doesn’t seem like the sort of place hospitable to life. It is dry and cold.
So Is There Life on Mars?
- “Is there life on Mars?” is a question people have asked for more than a century.
- Perseverance will use its instruments to look for signs of ancient life in the delta and lake deposits on Mars.
- So Perseverance once returned to Earth, could provide new insight into the evolution of Mars and whether there was ever life on the Red Planet.
- Mars has very little air, no liquid water, and its surface is bathed in radiation. Its gravity is low and there is not much aerothermal heat to work with.
- That water is very salty and full of perchlorates, but there are bacteria here on Earth that can survive conditions of this kind.
- Deep underground, it might be quite warm and quite wet, just the kinds of conditions suitable for life.
- Billions of years ago Mars had a thick atmosphere and oceans just like Earth does today. However, over time the core of the planet cooled and froze solid, leaving the planet without a protective magnetic field.
- Without its magnetic field, the solar wind stripped away its atmosphere, carrying away 85% of the planet’s water and reducing the atmospheric pressure so low that liquid water could no longer exist on the surface.
- Deep below the surface, the pressure is high enough that liquid water still exists, meaning it is possible that life still exists deep in the soil.
The 5 Possibilities For Life On Mars
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https://www.forbes.com/sites/startswithabang/2020/08/04/the-5-possibilities-for-life-on-mars/?sh=146eee815387
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