How long does it take sun damage on the skin to surface?

I was told that most of us have sun damage (example: freckles) that we can’t see with the naked eye. If you go into a dark room and put a black light next to your face, you can see some freckles on your skin that you don’t see in regular light. Will that [...]

How long (approximately) will the Sun maintain the current levels of heat and brightness?

How long (approximately) will the Sun maintain the current levels of heat and brightness?

How long does it take for radiation from the sun to reach earth?

Earth is about 150 million km from the sun. The radiation from the sun travels at 300,000 km/s. How long does it take for the radiation from the sun to reach earth?
Thanks for all yur answers!

Low Risk Bets For Long Term Profits.

Dont Lose Your Shirt! – EBook(R) & Software – Affiliates Earn 60%.
Low Risk Bets For Long Term Profits.

How long would the Sun burn if it was a huge fire releasing chemical energy?

Assume that the Sun begins with 10^8 joules per kilogram.
The Sun is 1.99*10^30 kg.
I have no idea what formula to use.