What two quantities do we need to measure to calculate the tangential velocity of a star?
A) distance and radial velocity
B) distance and proper motion
C) parallax and distance
D) radial velocity and proper motion
Correct Answer:
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Q12: Proper motion of a star is defined
Q13: If a star moves in space, its
Q14: Suppose a star lying on the celestial
Q15: The proper motion of a star is:
A)the
Q16: The speed of a star in km/s,
Q18: The star Procyon has a parallax of
Q19: The star Ross 128 has a parallax
Q20: Neptune is about 1.5 times as far
Q21: Light, leaving a point source, spreads
Q22: Suppose that, at night, the brightness of
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