The total mass of the pair of stars in spectroscopic binaries are difficult to estimate because
a. we can't measure the radial velocities of each star in the system.
b. we can't see the shape or tilt of the orbit.
c. we can't find the diameters of the stars.
d. we can't determine the luminosities of the stars.
e. the Doppler shift is not measurable.
Question 2
The optical shape of segmented mirrors is controlled by computer-driven thrusters under the mirrors in what is called
a. an achromatic lens.
b. active optics.
c. a Schmidt-Cassegrain design.
d. a Newtonian design.
e. interferometry.
Internal structures of main sequence stars, convection zones with arrowed cycles and radiative zones
Classifying the Spectra of Stars
Dred Scott and his wife and children are featured on the cover of Frank Leslie’s Illustrated Newspap
This five-wire mass air flow sensor consists of a metal foil sensing unit, an intake air temperature ...
Atomic Number and Mass Number
What is the mass of 1.20 x 1024 molecules of sulfur dioxide, SO2?