« previous next »

Author Question: What kind of variable stars are pre-Main Sequence stars undergoing gravitational contraction and ... (Read 94 times)

ishan

  • Hero Member
  • *****
  • Posts: 546
on: Jul 27, 2018
What kind of variable stars are pre-Main Sequence stars undergoing gravitational contraction and exhibiting erratic changes in their luminosities?
 
  A) R Coronae Borealis
  B) RR Lyrae
  C) Cepheid
  D) T Tauri
  E) Herbig-Haro

Question 2

What information about an astronomical object can be determined by observing its spectrum?
 
  A) its temperature
  B) its radial motion
  C) its chemical composition
  D) whether it has a strong magnetic field
  E) All of the above


chreslie

  • Sr. Member
  • ****
  • Posts: 307
Reply #1 on: Jul 27, 2018
Answer to Question 1

D

Answer to Question 2

E


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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?

Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.

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?

Drug-induced pharmacodynamic effects manifested in older adults include drug-induced renal toxicity, which can be a major factor when these adults are experiencing other kidney problems.

Arthroscopic surgery. In this illustration, the knee joint is undergoing surgery with a specialized Arthroscopic surgery. In this illustration, the knee joint is undergoing surgery with a specialized
Classifying the Spectra of Stars Classifying the Spectra of Stars
Post–Main-Sequence Evolution Post–Main-Sequence Evolution
William Kentridge, History of the Main Complaint. William Kentridge, History of the Main Complaint.
Sequence of events from DNA to protein. Sequence of events from DNA to protein.
Model of how direct repeats generated during the insertion of a transposon or an insertion sequence Model of how direct repeats generated during the insertion of a transposon or an insertion sequence
Video: Definition of heart rate

For a complete list of videos, visit our video library