Loon, the moonshot idea from Google parent Alphabet to provide internet access through huge balloons, is being terminated.

“While we’ve found a number of willing partners along the way, we haven’t found a way to get the costs low enough to build a long-term, sustainable business,” wrote Loon CEO Alastair Westgarth in a blog post Thursday night. “Developing radical new technology is inherently risky, but that doesn’t make breaking this news any easier. Today, I’m sad to share that Loon will be winding down.”

Westgarth noted that “the reality is Loon has been chasing the hardest problem of all in connectivity — the last billion users: The communities in areas too difficult or remote to reach, or the areas where delivering service with existing technologies is just too expensive for everyday people.”

And also Alphabet.

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