How has solar luminosity changed during the past 4.6 billion years?
What will be an ideal response?
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.
You might also like to view...
________ are tiny "seed" particles created when small sediments or shell fragments are rolled by waves in water supersaturated with calcium carbonate
A) Bryozoans B) Cave pearls C) Ooids D) Nodules
Which of the following pH's corresponds to a slightly acidic solution?
A) 2.8 B) 6.8 C) 7.2 D) 11.2
The conversion of a liquid into its vapor state is termed _______________
Fill in the blank(s) with correct word
Which of the following does NOT act upon winds that blow far above the surface of the Earth?
A) Coriolis effect B) Geostrophic C) Gravity D) Pressure gradient E) Friction