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Author Question: How has solar luminosity changed during the past 4.6 billion years? What will be an ideal ... (Read 55 times)

kshipps

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on: Jul 14, 2018
How has solar luminosity changed during the past 4.6 billion years?
 
  What will be an ideal response?

Question 2

Why is stratospheric ozone important to humans?
 
  What will be an ideal response?


steff9894

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Reply #1 on: Jul 14, 2018
Answer to Question 1

When the Sun first formed 4.6 billion years ago, it is believed to have been about 30 less luminous than it is today. The Sun's luminosity increased slowly at first and then more rapidly as the buildup of helium in its core continued. At present, the Sun is thought to be brightening by about 1 every hundred million years.

Answer to Question 2

Stratosphere ozone is important to living organisms because it absorbs many of the Sun's harmful ultraviolet rays. Ultraviolet radiation causes skin cancer and other health problems in humans.


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