This topic contains a solution. Click here to go to the answer

Author Question: What is the meaning of the solar constant? A) the regularity of the 11-year sunspot cycle B) the ... (Read 82 times)

ss2343

  • Hero Member
  • *****
  • Posts: 548
What is the meaning of the solar constant?
 
  A) the regularity of the 11-year sunspot cycle
  B) the amount of energy the Earth receives per unit area and unit time
  C) the stability of the Sun's luminosity for as long as life has existed on Earth
  D) the fact that features on the Sun appear to never change
  E) the fact that the amount of hydrogen turning into helium in the core is fixed

Question 2

Ptolemy was important in the history of astronomy because he ________.
 
  A) was the first to believe that all orbits are perfect circles
  B) was the first to create a model of the solar system that placed the Sun rather than the Earth at the center
  C) developed the first scientific model of the universe
  D) developed a model of the solar system that made sufficiently accurate predictions of planetary positions to remain in use for many centuries



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

gabrielle_lawrence

  • Sr. Member
  • ****
  • Posts: 353
Answer to Question 1

B

Answer to Question 2

D





 

Did you know?

Though Candida and Aspergillus species are the most common fungal pathogens causing invasive fungal disease in the immunocompromised, infections due to previously uncommon hyaline and dematiaceous filamentous fungi are occurring more often today. Rare fungal infections, once accurately diagnosed, may require surgical debridement, immunotherapy, and newer antifungals used singly or in combination with older antifungals, on a case-by-case basis.

Did you know?

Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

Did you know?

Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.

Did you know?

More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

Did you know?

An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

For a complete list of videos, visit our video library