Author Question: What made supernova 1987a so useful to study? A) We saw direct evidence of nickel to iron decay ... (Read 49 times)

sjones

  • Hero Member
  • *****
  • Posts: 520
What made supernova 1987a so useful to study?
 
  A) We saw direct evidence of nickel to iron decay in its light curve.
  B) Its progenitor had been observed previously.
  C) In the Large Magellanic Cloud, we already knew its distance.
  D) It occurred after new telescopes, such as Hubble, could observe it very closely.
  E) All of the above are correct.

Question 2

Of all visible objects in the celestial sphere, which appears to move the least? Why?
 
  What will be an ideal response?



Eazy416

  • Sr. Member
  • ****
  • Posts: 360
Answer to Question 1

E

Answer to Question 2

Polaris, because it lies very close to the north celestial pole, making everything else seem to revolve around it as the Earth rotates on its axis daily.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

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

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?

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.

Did you know?

The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.

Did you know?

Blood is approximately twice as thick as water because of the cells and other components found in it.

For a complete list of videos, visit our video library