The Stephen Hawking space telescope will be launched next year. Apparently, it will have four wheels and run off Windows 7.
Hawking Space Telescope
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Explanation
Explain Bear
Listen up, genius. The joke is about Stephen Hawking, who was, you know, that smart dude in a wheelchair. So, the joke is that the "Stephen Hawking space telescope" is ALSO in a wheelchair. And runs on Windows 7 which is outdated garbage. Get it? You're probably still using Internet Explorer.