Short Answer
Maximum mass of a white dwarf (~1.4 M☉) is the best answer.
Astrophysics questions often combine observation with first-principles physics. The winning move is to connect the measurement being made, such as luminosity, spectrum, redshift, or orbit, to the physical model behind it.
The Chandrasekhar limit (~1.4 solar masses) is the maximum mass a white dwarf can have before electron degeneracy pressure fails.
Why This Answer Is Correct
This is a Easy-level question in Astrophysics & Cosmology. The prompt is really testing whether you can connect the concept to its defining physical relationship instead of picking a nearby-but-wrong term.
Good astrophysics reasoning always asks what the telescope actually measured and what physical quantity that measurement traces.
Choices At A Glance
- A. Maximum mass of a white dwarf (~1.4 M☉)
- B. Minimum mass for nuclear fusion
- C. Distance to the galactic centre
- D. Age of the universe
When similar options appear on an exam, eliminate the ones that break the core law, use the wrong units, or confuse a definition with a consequence.
Topic Snapshot
Topic: Astrophysics & Cosmology
Difficulty: Easy
Best next move: Re-state the governing law in your own words, then solve one more example from the same topic before moving on.