Astronomers have recently discovered a stellar stream in our Milky Way galaxy that is believed to be the remnant of a dwarf galaxy. The stellar stream was discovered using data from the Gaia mission, a space-based observatory launched by the European Space Agency (ESA) in 2013. It is estimated that the stream is composed of stars that were once part of a dwarf galaxy, which was disrupted and assimilated by the Milky Way some eight billion years ago. The discovery of this stellar stream provides new insight into our galactic history and can help us understand the formation and evolution of our own galaxy.

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source: Phys.org