August 11, 2026
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- Like the earth’s oceans at their shores, the universe’s galaxies also experience tides, but on a much larger scale.
- Galactic tides are caused by gravitational forces within a galaxy, arising in the interactions between celestial objects like stars and gas clouds.
- These tidal forces influence various aspects of a galaxy’s evolution. They can reshape a galaxy structure by creating tidal tails and bridges, promoting star formation, and disrupting smaller star systems.
- Over aeons, galactic tides also disrupt the orbits of stars, leading to long-term changes in galactic structure.
- Galactic tides also have a say in the ways in which proximate galaxies do and don’t interact.
| The Andromeda galaxy is the closest galaxy to the Milky Way.
It is heading towards the Milky Way at 110 km/s and will collide in four billion years. |
- Galactic tides also affect the supermassive black holes at galaxy centres, leading to events that change the ways in which these cosmic beasts interact with nearby stars.
- In fact, researchers have found that the tidal streams near edges of Andromeda Galaxy could be signatures of dwarf galaxies that were later devoured.
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