This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Compare the amount of time a 20 solar mass star will stay on the main sequence to the length of time ... (Read 66 times)

wenmo

  • Hero Member
  • *****
  • Posts: 540
on: Jul 27, 2018
Compare the amount of time a 20 solar mass star will stay on the main sequence to the length of time its iron core can exist.
 
  What will be an ideal response?

Question 2

The youngest features visible with telescopes on the Moon are:
 
  A) the volcanoes seen erupting in the highlands.
  B) the craters sitting atop the mare.
  C) the darkest regions of the mare.
  D) the bright polar caps of new ice.
  E) the scarps recently created by tectonic activity.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

mistyjohnson

  • Sr. Member
  • ****
  • Posts: 331
Reply #1 on: Jul 27, 2018
Answer to Question 1

A 20 solar mass star will stay on the main sequence for 10 million years. Its iron core can exist for only a day.

Answer to Question 2

B


wenmo

  • Member
  • Posts: 540
Reply 2 on: Jul 27, 2018
Great answer, keep it coming :)

AngeliqueG

  • Member
  • Posts: 343
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.

Did you know?

Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.

Did you know?

In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

Did you know?

The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.

Did you know?

In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

Spectra of a Metal-Poor and a Metal-Rich Star Spectra of a Metal-Poor and a Metal-Rich Star
Cross-sectional data showing that the amount of effort spent on personal health care increases with Cross-sectional data showing that the amount of effort spent on personal health care increases with
The injector on-time is called the pulse width. The injector on-time is called the pulse width.
The DNA from one chromosome has a mass of ~20 billion Daltons The DNA from one chromosome has a mass of ~20 billion Daltons
Accumulation of toxicants over time and up the food chain Accumulation of toxicants over time and up the food chain
Disitive Time For Water Disitive Time For Water
Video: Pressure volume relationships - Normal inspiration and expiration

For a complete list of videos, visit our video library