Sunlight

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The sun is in average 227936637 km away from Mars. The Sunlight arrives after 13 minutes on Mars with a power of 589 W/m². It is not as bright as on Earth. No one has ever seen it, but it probably gives the impression of dawn or dusk during daytime. Colonists should have this impression only for a few days until their visual brain center adapts.

The Martian atmosphere does not filter der sunlight enough, leaving to much UV ray and high energy particles to reach the surface. Life is considered not possible without additional shielding.

Open issues

• What are the phychological and physiological effects of the permanent dim light on humans, animals and plants?
• Are there scientific facts of a positive effect of artificial light to compensate the lack of sunlight?