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...age:Stellarparallax2.svg|thumb|250px|right|The diagram illustrates stellar parallax motion. Credit: .]] ...nt resolution, it should be possible to measure the '''X-ray trigonometric parallax''' of nearby stars. ...

|title=Accreting white dwarf models for CAL 83, CAL 87 and other ultrasoft X-ray sources in the LMC ==X-rays== ...

...Ursae Majoris. It is listed in SIMBAD as an F7V spectral type star with a parallax of 74.19 mas. Credit: Aladin at SIMBAD.]] ...energy are (L/T²) and (L²/T²). Force (F) x distance (L) = energy (E), L/T² x L = L²/T². Force and energy are related to distance and time using proporti ...

...ive surfaces, one can locate successive sagittal image-points on the chief ray (produced rectilinearly through surfaces as necessary), and hence assess as ...at they believed in visual rays emitted by the eye, so that the "incident" ray is from the eye, not from the object-point; the "cathetus of incidence", if ...

...radiation astronomy: radio, infrared, visual, ultraviolet, soft and hard X-ray. Credit: NASA.{{tlx|free media}}]] ...relation between the arrival directions of cosmic rays with energy above 6 x 10¹⁹ electron volts and the positions of active galactic nuclei ...