galactic disk

galactic disk

See galaxies; Galaxy.

galactic disk

[gə′lak·tik ′disk]
(astronomy)
The flat distribution of stars and interstellar matter in the spiral arms and plane of the Milky Way Galaxy.
References in periodicals archive ?
These random in-and-out motions are referred to as "migration," and are likely caused by irregularities in the galactic disk, such as the Milky Way's famous spiral arms.
It is in the galactic disk, and not inside a globular cluster.
Nobody had seen the arm segment before because the galactic disk turns out to be slightly warped in the outer reaches, like a Frisbee left too long in the sun.
The stream they tested the new technique on was produced by a globular cluster named Palomar 5, and had already been discovered in 2001 high above the Galactic disk.
Most star clusters in the galactic disk dissolve rapidly, their stars migrating away from each other under the influence of gravitational tides.
We find that classical evolution paradigm of gradual enrichment and dynamical heating of the Galactic disk seem to fail several of the standard tests related to the stellar metallicity distribution, age-metallicity relation, and age-velocity relation.
The researchers believe that, up to a certain distance from the galactic disk, this halo is dense enough to affect the composition of dwarf galaxies.
The halo clouds skim the surface of our Galaxy, sitting 400 to 10 000 light-years outside the Galactic disk.
Because of the remnant's outgoing motion, theorists have proposed that the star that became Kepler's supernova was, in fact, born in the galactic disk with a partner star.
We would need to see our galaxy's disk from above to make the appropriate measurements; in reality, our Solar System sits within the galactic disk.
Astronomers had speculated that the gas was like a mist held in place by magnetic fields or cosmic rays streaming out of the galactic disk.
In the new study, Moran and his colleagues used the VLBA to study radio emissions produced by water molecules within a central galactic disk.