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.
Acromegaly in one individual from a pair of identical twins.
Pair of pygmy hippos beg for sugar cane at the Mount Kenya Wildlife Conservancy
How difficult is it for children to learn to speak two languages?
Advection of an air mass with a different ELR (environmental lapse rate).
Finding the length given total distance and distance longer than other point
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