Astronomers using the Gaia space telescope have located two ancient streams of stars that helped the Milky Way galaxy grow and evolve more than 12 billion years ago.
Astronomers have used the Gaia space telescope to spy some of the first building blocks of the Milky Way galaxy: two ancient streams of stars named Shakti and Shiva that helped our home galaxy grow and evolve more than 12 billion years ago. Named after Hindu deities, the star streams appear to be the remnants of two galaxies that merged with an early version of the Milky Way between 12 billion and 13 billion years ago when the first galaxies were forming across the cosmos.
Shakti and Shiva are near the Milky Way’s heart, and each stream is estimated to include the mass of about 10 million suns. Here, the ancient stars are all similar in age, orbital path and composition, which helped astronomers determine that both streams were likely threads from an outside source that wove together and became part of the Milky Way.
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Two of the Milky Way's earliest building blocks identifiedAstronomers have identified what could be two of the Milky Way's earliest building blocks: Named 'Shakti' and 'Shiva', these appear to be the remnants of two galaxies that merged between 12 and 13 billion years ago with an early version of the Milky Way, contributing to our home galaxy's initial growth.
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