NASA Astronomy Picture of the Day

November 17, 2025

Comet Lemmon's Wandering Tail

What has happened to Comet Lemmon's tail? The answer is blowing in the wind — the wind from the Sun in this case. This continuous outflow of charged particles from the Sun has been quite variable of late, as the Sun emits bursts of energy, CMEs, that push out and deflect charged particles emitted by the comet itself. The result is a blue hued ion tail for Comet C/2025 A6 (Lemmon) that is not only impressively intricate but takes some unusual turns. This long-duration composite image taken from Alfacar, Spain last month captured this inner Solar System ionic tumult. Comet Lemmon is now fading as it heads out away from the Earth and Sun and back into the outer Solar System.

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

Solar Cycles of Political Revolution, Flare Index, Sunspots | S0 News and other cool stuff

Nov.17.2025

https://www.youtube.com/watch?v=3EPZcW61Vg0

https://x.com/StefanBurnsGeo/status/1990223020921884788

https://x.com/MrMBB333

https://www.space.com/live/aurora-forecast-will-the-northern-lights-be-visible-tonight

https://www.space.com/astronomy/sun/how-the-sun-threatens-your-nuts-inside-the-usd100-million-solar-storm-peanut-problem

https://www.swpc.noaa.gov/

https://www.SpaceWeatherNews.com

Magnificent Images of Jets Around 3I/ATLAS

November 17, 2025

The astrophotographer Satoru Murata released here a stunning image of the interstellar object 3I/ATLAS combining 24 exposures of 60 seconds each with a 0.2-meter telescope (Celestron EdgeHD 800) in New Mexico, USA, on November 16, 2025.

The image shows multiple jets both towards and away from the Sun, including an anti-tail and a much longer tightly collimated tail.

A day later, on November 17, 2025, a newer image of 3I/ATLAS was posted here by Francois Kugel, combining 22 exposures of 30 seconds each with a 0.4-meter aperture telescope.

*The Virtual Telescope's livestream was rescheduled for Nov. 19th because of weather.

https://avi-loeb.medium.com/magnificent-images-of-jets-around-3i-atlas-e4ad8acc723c

https://usaherald.com/new-november-16-image-shows-3i-atlas-behaving-in-ways-no-natural-comet-should/

https://medium.com/@earthexistclothing/3i-atlas-the-geometric-jets-e801e6cb027a

https://medium.com/@earthexistclothing/3i-atlas-cassandra-unclassified-799785fc42ca

https://www.space.com/stargazing/watch-interstellar-comet-3iatlas-speed-away-from-the-sun-in-free-telescope-livestream-nov-16-2025

https://www.virtualtelescope.eu/2025/10/31/interstellar-comet-3i-atlas-c-2025-n1-atlas-online-observation-17-nov-2025/

https://www.youtube.com/watch?v=WfIg_3283pc (The Angry Astronaut: NEW 3I ATLAS DISCOVERY proves that this thing can't be a comet!)

https://www.youtube.com/watch?v=6Vu-1aV1FrI (Maussan: The Silent UFO Invasion | 3I/atlas special investigation 🛸)

https://www.youtube.com/watch?v=2ZCQFAokJQE (Ray's Astrophotography: Comet 3i Atlas is SPINNING - I took a picture)

https://www.youtube.com/watch?v=Uz07Iz307lU (Ray's Astrophotography: Comet 3i Atlas is STRANGE and it is NEXT to the MOON - I took a picture)

https://www.youtube.com/watch?v=xt-HEl3rwhM (Dobsonian Power: LIVE VIEWS OF 3I/ATLAS! WHAT ARE THEY HIDING?)

>>23865198

Structured Geometry of 3I/Atlas Emerging in New Imagery

November 16, 2025

More and more images are coming in of 3I/Atlas — many of which seem intentionally “over-exposed” so as to hide geometry of its previously noted structure.

When we photograph the moon, we have to expose it so we can see surface details very well, even though is is very bright, even to the human eye.

On bright objects with surface detail, we just have to lower the exposure by dropping down the aperature or shortening the exposure time.

We can see this image by T. Thaluang, is a 0.26 Meter at f/4.2 aperature. That is very open.

He could just adjust that to an f/8–22 and we would see way more details at the surface, and he might have done that and not shared those images on purpose. In fact, most of the new images are overexposed to hide surface details.

I took the core image of 3I/Atlas into photoshop and dial it down in brightness and I can see square stepped surfaces at the top and 3 dark holes, as well as layers of grey-scale that have real structure.

The very bottom has a long flat edge and jagged edges that reveal real structure before I am zoomed all the way into square pixels.

Here, I brought it’s brightness values way down and we can see what I am seeing in the data.

There is a lot of structure, which makes me very suspicious why they did not give us proper exposures, which I am sure they took, so these surface details would be more evident in the photograhy. A

ny good photographer knows this when taking photos of the moon.

Here is a great example from NASA’s Lunar photography guide:

The top left is over-exposed — which is what astronomers are giving us of 3I/Atlas. The bottom row shows much better surface details. This is what we need of 3I/Atlas!

By adjusting it in photoshop, I am still not seeing as much as I should.

By lowering the values of the lunar photography in photoshop, right angles appear because there are geometries from the craters on the lunar surface.

Notice this lowering of values does not give me correct values for what those geometries really look like.

We need correct exposures of 3I/Atlas to reveal surface details and they know this.

https://medium.com/@davidsereda/structured-geometry-of-3i-atlas-emerging-in-new-imagery-b13ba0ecfbb7

>>23865213

Comet C/2025 K1 ATLAS: the broken comet – online observation (25 Nov. 2025)

11/17/2025

Comet C/2025 K1 ATLAS experienced a dramatic fragmentation event, becoming one of the most interesting objects of its kind seen in recent years.

The Virtual Telescope Project, which provided an excellent coverage of the event, will show this comet and its broken nucleus live, online.

The Virtual Telescope Project will show the amazing comet C/2025 K1 ATLAS live, while it will be at its minimum distance from the Earth. We will spy together its broken nucleus and unveil its fragments in real time.

On 25 Nov. 2025, starting at 03:00 UTC, we will share real-time images of that comet captured via our robotic telescopes in Manciano, Italy. Join this unique opportunity from the comfort of your home!

https://www.virtualtelescope.eu/2025/11/17/comet-c-2025-k1-atlas-the-broken-comet-online-observation-25-nov-2025/