« previous next »

Author Question: Generally speaking, how does the surface temperature and luminosity of a protostar compare to the ... (Read 42 times)

deesands

  • Hero Member
  • *****
  • Posts: 514
on: Jul 27, 2018
Generally speaking, how does the surface temperature and luminosity of a protostar compare to the surface temperature and luminosity of the main-sequence star it becomes?
 
  A) A main-sequence star is cooler and dimmer than it was as a protostar.
  B) A main-sequence star is cooler and brighter than it was as a protostar.
  C) A main-sequence star is hotter and brighter than it was as a protostar.
  D) A main-sequence star is hotter and dimmer than it was as a protostar.

Question 2

The gravitational lens effect has been verified by
 
  A) observations of multiple images of the same background galaxy seen towards a massive galaxy cluster.
  B) single images of highly distorted, high-redshift galaxies seen towards massive galaxy clusters.
  C) observations of the bending of starlight by the Sun during a 1919 eclipse.
  D) all of the above
  E) None of the above; this effect is purely hypothetical.


ju

  • Sr. Member
  • ****
  • Posts: 325
Reply #1 on: Jul 27, 2018
Answer to Question 1

D

Answer to Question 2

D


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.

Did you know?

All adverse reactions are commonly charted in red ink in the patient's record and usually are noted on the front of the chart. Failure to follow correct documentation procedures may result in malpractice lawsuits.

Did you know?

The use of salicylates dates back 2,500 years to Hippocrates's recommendation of willow bark (from which a salicylate is derived) as an aid to the pains of childbirth. However, overdosage of salicylates can harm body fluids, electrolytes, the CNS, the GI tract, the ears, the lungs, the blood, the liver, and the kidneys and cause coma or death.

Did you know?

The average person is easily confused by the terms pharmaceutics and pharmacology, thinking they are one and the same. Whereas pharmaceutics is the science of preparing and dispensing drugs (otherwise known as the science of pharmacy), pharmacology is the study of medications.

Did you know?

Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.

The platypus is very difficult to spot even on the surface of a river. The platypus is very difficult to spot even on the surface of a river.
Taking a Patient’s Axillary Temperature Taking a Patient’s Axillary Temperature
Luminosity Classes Luminosity Classes
The level in the coolant recovery system raises and lowers with engine temperature. The level in the coolant recovery system raises and lowers with engine temperature.
Surface molecules involved in the interaction between an antigen-presenting cell and a CD4+ T cell. Surface molecules involved in the interaction between an antigen-presenting cell and a CD4+ T cell.
Cell Surface Regulators Cell Surface Regulators
Video: Types of Burns

For a complete list of videos, visit our video library