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.
The mark-recapture technique is often used to estimate population size.
All objects in the image are distant galaxies – not stars
The Pleiades, an open cluster of stars in the constellation of Taurus.
Internal structures of main sequence stars, convection zones with arrowed cycles and radiative zones
Selected Complications of Total Parenteral Nutrition
Calculation of body mass index. To determine your BMI, find the value for your height on the left ...