☰ Contents · Astronomy

Distances to stars and their sizes

Lessons 46–47 · 2 lessons · M. Mamadazimov. Astronomy Grade 11, 1st edition. DAVR NASHRIYOTI, Tashkent, 2018
Answers are for parents and teachers.
1
If π = 125 mas, how many parsecs is d? (1000 : 125)
2
π = 40 mas: how many parsecs is d?
3
L = 900 L☉, T = T☉. R = √900 = ?
4
With L = 1 L☉ and T = T☉ / 2, R / R☉ = 1 · 2² = ?
5
Why is the parallax method of little use for stars hundreds of parsecs away?