Spectroscopic and eclipse duration observations of an eclipsing binary star can enable astronomers to calculate________ of its individual stars
a. the masses
b. the sizes
c. the masses and sizes
d. neither masses nor sizes
c
You might also like to view...
In pre-Copernican astronomy, it was almost universally believed that
a. the planets traveled in elliptical orbits about Earth. b. the center of the universe was the Sun with the Milky Way representing other distant planets. c. the Sun was at the center of the universe. d. Earth was at the center of the universe. e. None of the above was believed.
In stage 3 of star formation, the cloud has collapsed enough that its inner regions are opaque to their own radiation
Indicate whether the statement is true or false
A race car travels 40 m/s around a banked (45° with the horizontal) circular (radius = 0.20 km) track. What is the magnitude of the resultant force on the 80-kg driver of this car?
a. 0.68 kN b. 0.64 kN c. 0.72 kN d. 0.76 kN e. 0.52 kN
The source of energy in the Sun is
A. uranium chain reaction B. radioactivity of tritium C. fusion of hydrogen D. radioactivity of potassium-40