Author Question: What made supernova 1987a so useful to study? A) We saw direct evidence of nickel to iron decay ... (Read 42 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?

During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

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).

Did you know?

Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.

Did you know?

Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.

Did you know?

Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.

For a complete list of videos, visit our video library