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 "Emu in the sky," a constellation defined by dark clouds rather than the stars.
The acetic acid–acetate pair as a buffer system
Change in Bone Mass over Time In your early years, more bone mass is added than lost in your body
The mole fraction of oxygen in dry air near sea level is 0.20948, where the molar mass of ...
What is the isotopic atomic mass of an isotope if 9.7023 1022 atoms weighs 4.0256 g?