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  2. Methods of detecting exoplanets - Wikipedia

    en.wikipedia.org/wiki/Methods_of_detecting_exo...

    While the radial velocity method provides information about a planet's mass, the photometric method can determine the planet's radius. If a planet crosses in front of its parent star's disk, then the observed visual brightness of the star drops by a small amount, depending on the relative sizes of the star and the planet. [6]

  3. X Window System - Wikipedia

    en.wikipedia.org/wiki/X_Window_System

    The Android X Server is an open source Java implementation that runs on Android devices. When an operating system with a native windowing system hosts X in addition, the X system can either use its own normal desktop in a separate host window or it can run rootless , meaning the X desktop is hidden and the host windowing environment manages the ...