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Chirp! is a GNU Social instance for the Cooley and Sekula families and their friends.

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https://files.mastodon.social/media_attachments/files/109/954/071/266/398/422/original/f80343c50107aa6a.jpeg

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  1. Robert McNees (mcnees@mastodon.social)'s status on Thursday, 02-Mar-2023 14:06:25 UTC Robert McNees Robert McNees
    in reply to

    The plaque is decoded via its depiction, in the upper-left corner, of the hyperfine transition in neutral hydrogen.

    The hyperfine transition emits a photon with a characteristic wavelength of 21cm and frequency of 1,420 MHz. Distances and frequencies shown on the plaque use these as base units.

    In conversation Thursday, 02-Mar-2023 14:06:25 UTC from mastodon.social permalink
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Chirp! is a social network. It runs on GNU social, version 2.0.1-beta0, available under the GNU Affero General Public License.

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