• The Princeton Review
    FREE GMAT Exam
    Know how you'd score today for $0

    Available with Beat the GMAT members only code

    MORE DETAILS
    The Princeton Review
  • PrepScholar GMAT
    5 Day FREE Trial
    Study Smarter, Not Harder

    Available with Beat the GMAT members only code

    MORE DETAILS
    PrepScholar GMAT
  • Varsity Tutors
    Award-winning private GMAT tutoring
    Register now and save up to $200

    Available with Beat the GMAT members only code

    MORE DETAILS
    Varsity Tutors
  • Veritas Prep
    Free Veritas GMAT Class
    Experience Lesson 1 Live Free

    Available with Beat the GMAT members only code

    MORE DETAILS
    Veritas Prep
  • e-gmat Exclusive Offer
    Get 300+ Practice Questions
    25 Video lessons and 6 Webinars for FREE

    Available with Beat the GMAT members only code

    MORE DETAILS
    e-gmat Exclusive Offer
  • Target Test Prep
    5-Day Free Trial
    5-day free, full-access trial TTP Quant

    Available with Beat the GMAT members only code

    MORE DETAILS
    Target Test Prep
  • Economist Test Prep
    Free Trial & Practice Exam
    BEAT THE GMAT EXCLUSIVE

    Available with Beat the GMAT members only code

    MORE DETAILS
    Economist Test Prep
  • Kaplan Test Prep
    Free Practice Test & Review
    How would you score if you took the GMAT

    Available with Beat the GMAT members only code

    MORE DETAILS
    Kaplan Test Prep
  • EMPOWERgmat Slider
    1 Hour Free
    BEAT THE GMAT EXCLUSIVE

    Available with Beat the GMAT members only code

    MORE DETAILS
    EMPOWERgmat Slider
  • Magoosh
    Magoosh
    Study with Magoosh GMAT prep

    Available with Beat the GMAT members only code

    MORE DETAILS
    Magoosh

The supernova event of 1987

This topic has 1 expert reply and 1 member reply

The supernova event of 1987

Post Mon Sep 25, 2017 6:03 pm
The supernova event of 1987 is interesting in that there is still no evidence of the neutron star that current theory says should have remained after a supernova of that size. This is in spite of the fact that many of the most sensitive instruments ever developed have searched for the tell-tale pulse of radiation that neutron stars emit. Thus, current theory is wrong in claiming that supernovas of a certain size always produce neutron stars.

Which one of the following, if true, most strengthens the argument?

A) Most supernova remnants that astronomers have detected have a neutron star nearby.

B) Sensitive astronomical instruments have detected neutron stars much farther away than the location of the 1987 supernova.

C) The supernova of 1987 was the first that scientists were able to observe in progress.

D) Several important features of the 1987 supernova are correctly predicted by the current theory.

E) Some neutron stars are known to have come into existence by a cause other than a supernova explosion.

The OA is B.

Can any expert go option by option telling me why are incorrect (or correct)? Thanks.

  • +1 Upvote Post
  • Quote
  • Flag
Post Sat Oct 21, 2017 6:23 pm
Hello Vincen.

I think options D and E are irrelevant to the argument.

But, with options A and C I don't know how to conclude they are incorrect.

  • +1 Upvote Post
  • Quote
  • Flag

GMAT/MBA Expert

Post Mon Oct 30, 2017 11:34 am
The conclusion: Supernovas of a certain size do not always produce neutron stars.

The evidence: There is no evidence of the neutron star that current theory says should have remained after the supernova of 1987 even though many of the most sensitive instruments ever developed have searched for the tell-tale pulse of radiation that neutron stars emit.

Assumption: If there was a neutron star, the instruments would have detected it. If this were true, then the argument would hold, the conclusion would be strengthened. This is what Choice B strongly implies. The instruments used were more than capable of detecting the neutron star -- they've even detected stars much farther away.

Choice A mentions supernova events in general, but not specify their size. It does nothing to support the conclusion that supernovas of a certain size don't always produce neutron stars.
Choice C is irrelevant. Whether that supernova was first, second, etc. does not matter.
Choice D leaves out any mention of the neutron star that is central to this argument.
Choice E brings in an "other," something to watch out for. That neutron stars can come about without a supernova explosion doesn't affect the discussion of this supernova explosion.


I'm available if you'd like any follow up.

_________________
GMAT Prep From The Economist
We offer 70+ point score improvement money back guarantee.
Our average student improves 98 points.

  • +1 Upvote Post
  • Quote
  • Flag
Free 7-Day Test Prep with Economist GMAT Tutor - Receive free access to the top-rated GMAT prep course including a 1-on-1 strategy session, 2 full-length tests, and 5 ask-a-tutor messages. Get started now.

Top First Responders*

1 GMATGuruNY 71 first replies
2 Rich.C@EMPOWERgma... 48 first replies
3 Brent@GMATPrepNow 37 first replies
4 Jay@ManhattanReview 26 first replies
5 ErikaPrepScholar 10 first replies
* Only counts replies to topics started in last 30 days
See More Top Beat The GMAT Members

Most Active Experts

1 image description GMATGuruNY

The Princeton Review Teacher

129 posts
2 image description Rich.C@EMPOWERgma...

EMPOWERgmat

116 posts
3 image description Jeff@TargetTestPrep

Target Test Prep

106 posts
4 image description Max@Math Revolution

Math Revolution

92 posts
5 image description Scott@TargetTestPrep

Target Test Prep

92 posts
See More Top Beat The GMAT Experts