So that's how this hoax got started. Put out a fake story and paste an image on it that makes it look like it's verified by a legitimate organization.
Sorry to break it to you that we won't go weightless on Sunday.
And another word to the wise: before you go sharing and retweeting things online, consider doing some homework first. Can you answer the question "Is this inforamtion coming from a legitimate news site?" If you're still unsure, do a quick Google search. If your homework makes you go "Wow!" then by all means share and RT.
And make sure to #beready for internet hoaxes in the future because they're looking even more real these days.