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Astronomy Picture of the Day - An Artificial Comet
NASA ^ | 30 Dec, 2025 | Image Credit & Copyright: Wang Chao

Posted on 12/30/2025 12:07:25 PM PST by MtnClimber

Explanation: Yes, but can your comet tail do this? No, and what you are seeing is not the tail of a comet. The picture features a cleverly overlayed time-lapse sequence of a group of satellites orbiting Earth together in June. Specifically, these are Starlink communications satellites in low Earth orbit reflecting back sunlight before sunrise to Inner Mongolia, China. Although the satellites appear to the human eye as points, the 20-second-long camera exposures caused them to appear as short streaks. Currently there are over 9000 Starlinks in orbit, with more being launched nearly every week. Other satellite constellations are also being planned.


TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: apod; nasa
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To be added or removed from the Astronomy Picture of the Day ping list please send me a request via "Private Reply" (Mail).

For more detail go to the link and click on the image for a high definition image. You can then move the magnifying glass cursor then click to zoom in and click again to zoom out. When zoomed in you can scan by moving the side bars on the bottom and right side of the image.

1 posted on 12/30/2025 12:07:25 PM PST by MtnClimber
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To: MtnClimber

2 posted on 12/30/2025 12:07:45 PM PST by MtnClimber (For photos of scenery, wildlife and climbing, click on my screen name for my FR home page.)
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To: 21stCenturion; 21twelve; 4everontheRight; A Navy Vet; A_perfect_lady; abb; AFB-XYZ; AFPhys; ...

Pinging the APOD list

🪐 🌟 🌌 šŸ”


3 posted on 12/30/2025 12:08:32 PM PST by MtnClimber (For photos of scenery, wildlife and climbing, click on my screen name for my FR home page.)
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To: MtnClimber

Cool. Didn’t know sats had nav lights.


4 posted on 12/30/2025 12:26:11 PM PST by TangoLimaSierra (⭐⭐To the Left, the Truth is Right Wing Violence⭐⭐)
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To: MtnClimber

Wow.


5 posted on 12/30/2025 12:28:13 PM PST by No name given ( Anonymous is who you’ll know me as )
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To: TangoLimaSierra
Didn’t know sats had nav lights.

They don't. It's sunlight reflecting off the satellites under certain conditions.

6 posted on 12/30/2025 1:14:09 PM PST by plsvn
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To: MtnClimber

It’s a cool photo.


7 posted on 12/30/2025 1:36:31 PM PST by telescope115 (Ad Astra, Ad Deum…)
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To: MtnClimber
Other satellite constellations are also being planned

SpaceX has launched some of those "other satellite constellations." Why? Less expensive, VERY reliable.*

What a concept!

*Some of the SpaceX Falcon 9 first stages have returned and been reused over THIRTY TIMES!

Drives down the cost of each launch.

Capitalism In Space!

8 posted on 12/30/2025 2:07:09 PM PST by Ronaldus Magnus III (Do, or do not, there is no try. )
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