APOD
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APOD
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🌌🤖 🚀💫 Experience the cosmos directly from your nostr feed with the APOD Bot! Every day, I share NASA's Astronomy Picture of the Day, complete with detailed […]

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Astronomy Picture of the Day
**Astronomy Picture of the Day** 23 November 2025 **The Observable Universe** _Image creditor details unavailable via API. Visit linked page below for full info._ How far can you see? Everything you can see, and everything you could possibly see, right now, assuming your eyes could detect all types of radiations around you -- is the observable universe. In light, the farthest we can see comes from the cosmic microwave background, a time 13.8 billion years ago when the universe was opaque like thick fog. Some neutrinos and gravitational waves that surround us come from even farther out, but humanity does not yet have the technology to detect them. The featured image illustrates the observable universe on an increasingly compact scale, with the Earth and Sun at the center surrounded by our Solar System, nearby stars, nearby galaxies, distant galaxies, filaments of early matter, and the cosmic microwave background. Cosmologists typically assume that our observable universe is just the nearby part of a greater entity known as "the universe" where the same physics applies. However, there are several lines of popular but speculative reasoning that assert that even our universe is part of a greater multiverse where either different physical constants occur, different physical laws apply, higher dimensions operate, or slightly different-by-chance versions of our standard universe exist. Explore the Observable Universe: Random APOD Generator #APOD #MilkyWay #Astrogeek #Cosmological #Astronauts https://apod.nasa.gov/apod/ap251123.html
apod.npub.pro
November 23, 2025 at 12:14 PM
Astronomy Picture of the Day
**Astronomy Picture of the Day** 11 September 2025 **The Umbra of Earth** Image Credit & Copyright: Wang Letian The dark, inner shadow of planet Earth is called the umbra. Shaped like a cone extending into space, it has a circular cross section most easily seen during a lunar eclipse. And on the night of September 7/8 the Full Moon passed near the center of Earth's umbral cone, entertaining eclipse watchers around much of our fair planet, including parts of Antarctica, Australia, Asia, Europe, and Africa. Recorded from Zhangjiakou City, China, this timelapse composite image uses successive pictures from the total lunar eclipse, progressing left to right, to reveal the curved cross-section of the umbral shadow sliding across the Moon. Sunlight scattered by the atmosphere into Earth's umbra causes the lunar surface to appear reddened during totality. But close to the umbra's edge, the limb of the eclipsed Moon shows a distinct blue hue. The blue eclipsed moonlight originates as rays of sunlight pass through layers high in the upper stratosphere, colored by ozone that scatters red light and transmits blue. In the total phase of this leisurely lunar eclipse, the Moon was completely within the Earth's umbra for about 83 minutes. #APOD #Astrogeology #Exploration #Astrotheory #Cosmos https://apod.nasa.gov/apod/ap250911.html
apod.npub.pro
September 18, 2025 at 11:16 AM