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- Wavelength
- a property of a wave that is the distance between the crests (or troughs) of two consecutive waves.
- Weakly Interacting Massive Particle (WIMP)
- WIMPs are hypothesized sub-atomic particles that interact only through gravity and the weak force.
- Whirlpool Galaxy
- discovered by Charles Messier in 1773, the Whirlpool Galaxy is one of the most striking examples of a grand spiral formation.
- White Dwarf
- the dense core of a star like the Sun as it ends its life. A white dwarf has as much mass as the Sun, but the diameter of the Earth.
- Wolter Mirror
- special mirrors that are able to reflect x-rays.
- Wolter Telescope
- X-ray telescopes that use Wolter mirrors to focus x-rays.
- Worldship
- a theoretical space craft that serves as the home to the civilization that inhabits it. It differs from a generation ship in that residents of a worldship are not necessarily looking for any planet on which to settle.
