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

Author Question: Which of the following types of molecule is the most abundant in an interstellar molecular cloud? ... (Read 134 times)

saliriagwu

  • Hero Member
  • *****
  • Posts: 537
Which of the following types of molecule is the most abundant in an interstellar molecular cloud?
 
  A) CO
  B) H2O
  C) H2
  D) NH3

Question 2

Explain how astronomers determine the size of an asteroid without resolving it.
 
  What will be an ideal response?



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

britb2u

  • Sr. Member
  • ****
  • Posts: 331
Answer to Question 1

C

Answer to Question 2

The brightness of an asteroid depends on its size, distance, and reflectivity. The brightness can be measured using a telescope, the distance is known from its orbit, and the reflectivity can be measured by comparing how bright the asteroid is at visible and infrared wavelengths. A highly reflective asteroid does not absorb much sunlight and is cooler than a darker asteroid. It will therefore shine less brightly at infrared wavelengths, relative to its visible brightness, than the dark asteroid. Once the reflectivity and size are known, the size can be determined from the asteroid brightness: for a given reflectivity and distance, the brightness depends on how large the asteroid is.





 

Did you know?

Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.

Did you know?

Historic treatments for rheumatoid arthritis have included gold salts, acupuncture, a diet consisting of apples or rhubarb, nutmeg, nettles, bee venom, bracelets made of copper, prayer, rest, tooth extractions, fasting, honey, vitamins, insulin, snow collected on Christmas, magnets, and electric convulsion therapy.

Did you know?

Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.

Did you know?

A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.

Did you know?

According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.

For a complete list of videos, visit our video library