« previous next »

Author Question: What made supernova 1987a so useful to study? A) We saw direct evidence of nickel to iron decay ... (Read 17 times)

sjones

  • Hero Member
  • *****
  • Posts: 520
on: Jul 27, 2018
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
Reply #1 on: Jul 27, 2018
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
« previous next »
 

Did you know?

Most strokes are caused when blood clots move to a blood vessel in the brain and block blood flow to that area. Thrombolytic therapy can be used to dissolve the clot quickly. If given within 3 hours of the first stroke symptoms, this therapy can help limit stroke damage and disability.

Did you know?

According to animal studies, the typical American diet is damaging to the liver and may result in allergies, low energy, digestive problems, and a lack of ability to detoxify harmful substances.

Did you know?

The Centers for Disease Control and Prevention (CDC) was originally known as the Communicable Disease Center, which was formed to fight malaria. It was originally headquartered in Atlanta, Georgia, since the Southern states faced the worst threat from malaria.

Did you know?

The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.

Did you know?

It is difficult to obtain enough calcium without consuming milk or other dairy foods.

Jacques-Louis David, Study for the Death of Socrates. Jacques-Louis David, Study for the Death of Socrates.
Leonardo da Vinci, Study of a Woman's Head or of the Angel of the Vergine delle Rocce. Leonardo da Vinci, Study of a Woman's Head or of the Angel of the Vergine delle Rocce.
Direct percussion Direct percussion
Study egocentrism in children Study egocentrism in children
A carbon-14 nucleus decays to a nitrogen-14 nucleus by beta-minus decay. How much energy (in ... A carbon-14 nucleus decays to a nitrogen-14 nucleus by beta-minus decay. How much energy (in ...
Pulse–chase labeling evidence of bidirectional DNA replication in mammalian chromosomes Pulse–chase labeling evidence of bidirectional DNA replication in mammalian chromosomes
Video: Fractures Animation

For a complete list of videos, visit our video library