« previous next »

Author Question: How has solar luminosity changed during the past 4.6 billion years? What will be an ideal ... (Read 108 times)

kshipps

  • Hero Member
  • *****
  • Posts: 571
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

  • Sr. Member
  • ****
  • Posts: 337
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.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.

Did you know?

The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.

Did you know?

The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

Did you know?

Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

Did you know?

More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.

Deciduous and permanent teeth. (A) The deciduous teeth, with the age of eruption given in months; (B Deciduous and permanent teeth. (A) The deciduous teeth, with the age of eruption given in months; (B
From this 1946 photo, you can see how computers have changed. This is the ENIAC, the world’s first ... From this 1946 photo, you can see how computers have changed. This is the ENIAC, the world’s first ...
Active solar technologies use for heat, cool, and produce electricity Active solar technologies use for heat, cool, and produce electricity
Solar updraft towers Solar updraft towers
What amount was invested 35 years ago at 7% compounded semiannually if the value of the ... What amount was invested 35 years ago at 7% compounded semiannually if the value of the ...
Video: Fetal development - Weeks 9 to 38

For a complete list of videos, visit our video library