Knowra Whirlpool Galaxy Whirlpool Galaxy The Whirlpool Galaxy, or M51, is a grand-design spiral galaxy in Canes Venatici whose prominent arms are shaped by interaction with the smaller galaxy NGC 5195.
NGC 5195 : NGC 5195 is a compact galaxy interacting with the Whirlpool Galaxy. Its close passage helps drive the Whirlpool Galaxy’s prominent spiral pattern.
Messier 51 : Messier 51 is the catalog designation for the Whirlpool Galaxy. This familiar name identifies the galaxy in observing guides and astronomical catalogs.
Spiral galaxy : A spiral galaxy is a disk-shaped galaxy with a central bulge and spiral patterns of stars, gas, and dust. The Whirlpool is a prominent example of this broad galaxy form.
Pinwheel Galaxy : The Pinwheel Galaxy, or Messier 101, is a large face-on spiral galaxy in Ursa Major. Unlike the Whirlpool, its prominent spiral pattern is not centered on a close interacting companion.
Galaxy interaction : Galaxy interaction is the gravitational influence galaxies exert on one another during close encounters or mergers. It explains how NGC 5195 can reshape the Whirlpool Galaxy without colliding directly with its stars.
Hubble Space Telescope : The Hubble Space Telescope is a space-based observatory launched in 1990, operating mainly in ultraviolet, visible, and near-infrared light. Its images resolve star-forming regions and dust lanes across the Whirlpool’s disk.
Grand-design spiral galaxy : A grand-design spiral galaxy has two or a few well-defined, coherent spiral arms. Its two conspicuous arms distinguish the Whirlpool from flocculent spirals with fragmented patterns.
Sombrero Galaxy : The Sombrero Galaxy, or Messier 104, is a galaxy with a bright central bulge and a prominent dust lane. Its smooth bulge and narrow disk present a striking alternative to the Whirlpool’s open spiral arms.
Density wave theory : Density wave theory explains spiral arms as regions of enhanced density moving through a rotating galactic disk. It describes how the Whirlpool’s arms can remain prominent as stars and gas move through them.
James Webb Space Telescope : The James Webb Space Telescope is a space observatory designed primarily for infrared astronomy. Its infrared view reveals dust and star-forming structures that visible-light images obscure.
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