Live GMAT classes with Target Test Prep start Nov 21 and Nov 22. First class free.

See classes
Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

Newsweek Readers’ Choice Awards 2026 winner: Target Test Prep, #1 Test Prep

Target Test Prep was voted #1 Best Test Prep in the 2026 Newsweek Readers’ Choice™ Awards.

★★★★★5.0563 reviews
GMATLiveTeachStarts Nov 22
Josh Braslow, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Josh Braslow, 20+ years in test prep

Nov 22 · Josh Braslow
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemandStart anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

EXECUTIVE ASSESSMENT

with

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemandStart anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions

The supernova event of 1987

Expert replies
by Vincen » 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.
Join the discussion
Source: — Critical Reasoning |

by VJesus12 » 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.
Join the discussion

by EconomistGMATTutor » 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.

Image
Join the discussion