The Milky Way Has Been Growing by Consuming Smaller Galaxies.


The Milky Way Has Been Growing by Consuming Smaller Galaxies.

 By absorbing smaller galaxies over billions of years, the Milky Way has grown. The Milky Way's gravity has the ability to tear apart a dwarf galaxy if it comes too close, scattering its stars into long streams and clouds around our galaxy. 🔭 Astronomers can identify these ancient mergers because the stolen stars retain unusual motions and chemical signatures.  Their routes may indicate that they came from somewhere other than the Milky Way. Gaia-Enceladus, a dwarf galaxy that merged with the young Milky Way about 8–10 billion years ago, is one of the most significant examples. Its remnants now make up a significant population of stars in the Milky Way’s stellar halo.

 The process continues to this day. The Sagittarius dwarf spheroidal galaxy is currently being disrupted by the Milky Way, leaving enormous streams of stars wrapped around our galaxy.

 ✨ Some of the stars we see in the Milky Way may have been born in galaxies that no longer exist.  The Milky Way’s history is, in part, a history of cosmic mergers.


 Writer: Binod Kumar Simkhada 
binodkumarsimkhada315@gmail.com

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