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Source channel @githubtrending · Post #15048 · Aug 12

#typescript The GitHub Actions Checkout action lets you download your repository code into the workflow environment so your automation can access it. It supports fetching specific branches, tags, or commits, and can fetch full history or just the latest commit. You can use tokens or SSH keys for authenticated access, enabling secure git commands during workflows. It also supports sparse checkouts to fetch only parts of the repo, and can handle submodules. This action simplifies automating tasks like testing, building, or deploying code by ensuring your workflow has the right code checked out efficiently and securely. https://github.com/actions/checkout

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Universe Mysteries 🪐

@cosmomyst · Post #98 · 08/08/2025, 03:11 AM

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🪐 In the galaxy M87, astronomers have filmed the shadow of a supermassive black hole using the Event Horizon Telescope, revealing a bright ring of light swirling around darkness. This "event horizon" is the boundary where nothing, not even light, can escape the black hole's gravity, and observing it directly helps scientists test the limits of Einstein’s theory of general relativity. ✨ #blackholes⚡#eventhorizon⚡#M87⚡#nasa⚡#galaxy⚡#stars⚡#astronomy⚡#universe⚡#cosmos⚡#space 👉subscribe Universe Mysteries

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Universe Mysteries 🪐

@cosmomyst · Post #49 · 07/31/2025, 12:11 AM

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🪐 The massive elliptical galaxy Messier 87 in the Virgo Cluster possesses a jet of energetic plasma that extends for nearly 5,000 light-years from its supermassive black hole. This powerful jet glows fiercely in visible and X-ray light, fueled by material swirling toward the event horizon and launched at nearly the speed of light into intergalactic space. ✨ #M87⚡#blackhole⚡#jet⚡#nasa⚡#galaxy⚡#stars⚡#astronomy⚡#universe⚡#cosmos⚡#space 👉subscribe Universe Mysteries

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