**Astronomy Picture of the Day**

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Kind-1 (TextNote)

2026-03-30T04:06:46Z

Astronomy Picture of the Day

30 March 2026

A Message from Earth

https://apod.nasa.gov/apod/image/2603/Message_Arecibo_960.jpg

Image Credit: Frank Drake, Arecibo Observatory, Arne Nordmann | License

Explanation:
What are these Earthlings trying to tell us?

The featured message was broadcast from Earth towards the globular star cluster M13 in 1974.

During the dedication of an upgrade to the Arecibo Observatory - then the largest single radio telescope in the world - a string of 1's and 0's representing the diagram was sent.

This attempt at extraterrestrial communication was mostly ceremonial - humanity regularly broadcasts radio and television signals out into space accidentally.

Even were this message received, M13 is so far away we would have to wait almost 50,000 years to hear an answer.

The featured message gives a few simple facts about humanity and its knowledge: from left to right are numbers from one to ten, atoms including hydrogen and carbon, some interesting molecules, DNA, a human with description, basics of our Solar System, and basics of the sending telescope.

Several searches for extraterrestrial intelligence are currently underway.

#APOD #Earth #RedPlanet #InterstellarMessage #SETI #Extraterrestrial

https://apod.nasa.gov/apod/ap260329.html

原始 JSON

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  "content": "**Astronomy Picture of the Day**\n\n30 March 2026\n\n**A Message from Earth**\n\nhttps://apod.nasa.gov/apod/image/2603/Message_Arecibo_960.jpg\n\nImage Credit: Frank Drake, Arecibo Observatory, Arne Nordmann | License\n\nExplanation:  \nWhat are these Earthlings trying to tell us? \n\nThe featured message was broadcast from \nEarth \ntowards the globular star cluster \nM13 in 1974. \n\nDuring the dedication of an upgrade to the \nArecibo \nObservatory - \nthen the largest single radio telescope in the world - \na string of 1's and 0's representing the diagram was sent. \n\nThis attempt at \nextraterrestrial communication \nwas mostly ceremonial - humanity regularly \nbroadcasts radio and television signals out into space accidentally. \n\nEven were \nthis message \nreceived, M13 is so far away we would \nhave to wait almost 50,000 years to hear an answer. \n\nThe featured message gives a few simple facts about humanity and its knowledge: \nfrom left to right are numbers from one to ten, atoms including \nhydrogen and \ncarbon, \nsome interesting molecules, \nDNA, a human with description, basics of our \nSolar System, \nand basics of the sending telescope. \n\nSeveral \nsearches for extraterrestrial intelligence are currently underway.\n\n#APOD #Earth #RedPlanet #InterstellarMessage #SETI #Extraterrestrial\n\nhttps://apod.nasa.gov/apod/ap260329.html\n",
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