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September 12, 2019

The sun is located at the heart of the solar system and it is by far the largest object in the universe. It holds 99.8% of the solar system’s mass and is roughly 109 times the diameter of the earth. This means that around one million Earths can fit inside the sun. The visible part of the sun has a temperature of about 10,000-degree Fahrenheit, while the temperatures of the core of the sun can reach up to 27 million-degree Fahrenheit. The extreme temperature of the sun is the result of the nuclear reactions that takes place inside the sun. 

Due to the nuclear reactions that happens inside the sun it emits rays of light that can be either good or harmful to us humans. Everyone who goes outside is exposed to the light rays of the sun. The most harmful light is the Ultraviolet light (UV) which is emitted by the sun. ultraviolet light has been known as the cause of many skin conditions which are harmful to our health. Too much exposure to the sun can lead to many changes in the skin such as formation of melanin clumps which can in turn lead to the formation of freckles and moles. Melanin is the pigment in our skin which gives us the color of the skin. Other than this the UV light is also known to lower the immune system as well. The immune system produces white blood cells to protect our body. When our skin gets sunburned the immune system release white blood cells to repair the damage caused by the skin burn. This can cause the immune system to be impaired in other areas of the body.  

Some of the more severe damages of the UV light includes eye injuries. The tissues in the eyes are very delicate. Due to the delicate nature of these tissues the harmful light from the sun can damage tissues in the eye and can burn the outer layer of the eye called the cornea. Also, sunlight can cause blurred vision and can cause formation of cataracts which can lead to blindness if left untreated.  The major to our health is that sunlight can cause skin cancer. Most skin cancer is nonmelanoma. It is very common, but also very treatable. Melanoma skin cancer is not as common, but is more severe. Skin cancer can spread to other areas in your body, especially if left untreated.

Even though the sunlight is harmful to human, it has some benefits to our health as well. A small amount of UV rays can help in the synthesis of Vitamin D. Vitamin D is the vitamin that absorbs calcium which is needed to build and maintain healthy bones. According to WHO, UV rays can help to treat some health condition such as eczema, psoriasis, and rickets. Also, sunlight has been known as the ideal treatment for jaundice in newborn babies.

Everyone is at risk of the effects of sun exposure regardless of their age or skin color. Sun light can be harmful as well as beneficial for our health.  Sunlight can have many harmful effects on our health such as skin changes, eye damages, skin cancer and it can lower our immune system. On the other hand, it can also have many beneficial effects on our health such as the synthesis of vitamin D which absorbs calcium and it can also be a treatment to many health conditions such as eczema, psoriasis and neonatal jaundice.
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