{
    "threads": [
        {
            "title": "NASA astronauts go back to the future with capsule launch",
            "category": "science",
            "articles": [
                "4089046912165831929.html",
                "1537185525800163964.html"
            ]
        },
        {
            "title": "Solving the space junk problem",
            "category": "science",
            "articles": [
                "3476726124715101580.html",
                "1950426314214238867.html"
            ]
        }
    ]
}