Sastrugi sea ice than on multiyear ice. First-year ice is smoother than multiyear ice, which allows the wind to pass uniformly over the surface without topographic obstructions. Except during the melt season, snow is dry and light in climates cold enough for sea ice, allowing the snow to be easily blown and create sastrugi parallel to the wind direction. The locations of sastrugi are fixed by March in the northern hemisphere and may be linked to the formation of melt ponds. Melt ponds are more likely to form in the depressions between zastrugi on first-year ice. Sastrugi Sastrugi, or zastrugi, are
Galactic winds Galactic winds Galactic winds are high velocity stellar winds. The phenomena is caused by either strong stellar winds emanating from newly formed massive stars or as the result of the effects of supermassive black holes. Galactic winds are strong stellar winds made up of charged particles, ejecta, and varying amounts of hot and cool gas. These gusts are caused by the release of ejecta by massive stars, spiral density waves, or supernovae. In galaxies with active galactic nuclei, galactic winds can also be driven by the effects of super-massive black holes. Galactic winds are considered an important function in the