Which statement about stellar motion is incorrect?. Physics & Astronomy

2019-11-13 19:57:43
Physics & Astronomy

the space velocity can be found from the radial and transverse velocities
radial velocity is measured by the Doppler shifts of the spectral lines
you must also know the parallax to get the transverse velocity
the closer stars usually show larger proper motions
proper motion is measured in intervals of six months

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