« previous next »

Author Question: What made supernova 1987a so useful to study? A) We saw direct evidence of nickel to iron decay ... (Read 40 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?

Though “Krazy Glue” or “Super Glue” has the ability to seal small wounds, it is not recommended for this purpose since it contains many substances that should not enter the body through the skin, and may be harmful.

Did you know?

According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.

Did you know?

Nearly all drugs pass into human breast milk. How often a drug is taken influences the amount of drug that will pass into the milk. Medications taken 30 to 60 minutes before breastfeeding are likely to be at peak blood levels when the baby is nursing.

Did you know?

The Centers for Disease Control and Prevention has released reports detailing the deaths of infants (younger than 1 year of age) who died after being given cold and cough medications. This underscores the importance of educating parents that children younger than 2 years of age should never be given over-the-counter cold and cough medications without consulting their physicians.

Did you know?

This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

The fibers in silk cloth and in a spider web are made up of the protein fibroin The fibers in silk cloth and in a spider web are made up of the protein fibroin
Model of a longitudinal study in which 983 students were surveyed in 1984 and then again in 1985, 19 Model of a longitudinal study in which 983 students were surveyed in 1984 and then again in 1985, 19
Hannah Höch, Study for "Cut with the Kitchen Knife Dada through the Last Weimar Beer Belly ... Hannah Höch, Study for "Cut with the Kitchen Knife Dada through the Last Weimar Beer Belly ...
Hurricane Formation and Decay Hurricane Formation and Decay
Performing a Correlational Study Performing a Correlational Study
No payments were made on a $2,598 loan during its three-year term. What was the annually ... No payments were made on a $2,598 loan during its three-year term. What was the annually ...
Video: Lower Limb Arteries Animation

For a complete list of videos, visit our video library