Home > Lifestyle > Sun > About the sun About the sun All sections in Sun » About the sun » Artificial tanning » Global warming » Health tips » Skin cancer » Suncare » The sun and your kids » Why we need the sun » Your skin and the sun » Sun News How does UVB work? Sunburn is your skin's reaction to ultraviolet radiation or UV. Go into the sun unprotected in any way and UV (both UVA and UVB) immediately penetrate your skin. Subscribe Newsletter » Like Health24 on Faceboook » Quiz Test your sun sense » Types of cancer prevalent in SA men Types of cancer prevalent in SA women Facts about the sun The sun is the only gigantic ball of superheated gas in our neighbourhood. It’s a massive nuclear reactor 12 000 times the size of the earth. How sun's radiation damages you The invisible ultraviolet sunrays are especially dangerous. They are UVA, UVB and UVC. Changes in UVA/UVB during the day Take a look at how UVA and UVB levels change on a typical cloudless summer day. “ Latest comment on Health24 James Smythe says... Quite frankly any prosecuting body which brings 192 charges and fails to get a conviction of almost all of them, needs to be closely examined - and probably closed down! Brown and the missing millions ” Prickly heat Prickly heat (heat rash) is a skin rash which appears in response to a child being very hot. load more articles advertisement From our sponsors There are more than 200 different viruses which can cause a cold A clinically proven skin care range is now available Medihelp’s regional information sessions Superior comfort and support Live healthier Keep your bones healthy » Osteoporosis risk The beauty of bones Ask the expert Osteoporosis facts Here are some interesting facts about the condition that you might not have known: Fight cold and flu » Myths and facts Cold or flu? Where germs hide 15 tips to stay healthy in winter Don't let colds and flu stop you this winter.