A typical spiral galaxy has _____ stars in a disk of diameter _____ ly.

Question

Quizplus · Accepted Answer

This is the most accurate estimate based on current observations of spiral galaxies, which have on average about 100 billion stars in a disk that is roughly 100,000 light years in diameter. Option B is incorrect because a diameter of 1000 light years is too small for a typical spiral galaxy. Option C is incorrect because 10⁹ stars is too few for a typical spiral galaxy, and a disk diameter of 10⁶ light years is too large. Option D is also incorrect because 10⁶ stars is too few for a typical spiral galaxy.

A Typical Spiral Galaxy Has _____ Stars in a Disk