Nereide
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drnereide.bsky.social
Nereide
@drnereide.bsky.social
Physicist interested in Astrophysics and Particle Physics| Research in Math and Science Edu| Math and Science Writer| Teacher and Teacher Trainer| WomenInSTEM

My science blog: https://www.tutto-scienze.org/

More about me: https://x.com/settings/bio
Pinned
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This breathtaking composite was obtained with data from Chandra, Hubble, Spitzer, to mark the 22nd anniversary in orbit of Hubble.

The pic shows 30 Doradus, also known as the Tarantula Nebula.

➡️ www.nasa.gov/image-articl...

Credits: NASA/CXC/PSU/STScI/JPL/L.Townsley et al.

🔭 🧪 #Hubble

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Reposted by Nereide
🧵
This breathtaking composite was obtained with data from Chandra, Hubble, Spitzer, to mark the 22nd anniversary in orbit of Hubble.

The pic shows 30 Doradus, also known as the Tarantula Nebula.

➡️ www.nasa.gov/image-articl...

Credits: NASA/CXC/PSU/STScI/JPL/L.Townsley et al.

🔭 🧪 #Hubble

1/5
November 20, 2025 at 12:00 AM
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This breathtaking composite was obtained with data from Chandra, Hubble, Spitzer, to mark the 22nd anniversary in orbit of Hubble.

The pic shows 30 Doradus, also known as the Tarantula Nebula.

➡️ www.nasa.gov/image-articl...

Credits: NASA/CXC/PSU/STScI/JPL/L.Townsley et al.

🔭 🧪 #Hubble

1/5
November 20, 2025 at 12:00 AM
Reposted by Nereide
🧵
I was browsing through NASA’s Photojournal archive when I found this historic image of Saturn, taken by Voyager 2 on Aug. 11, 1981.

The spacecraft was about 14.7 million kilometres away when the picture was captured.

Image credit: NASA/JPL

➡️ science.nasa.gov/photojournal...

🔭 🧪 #histsci

1/5
November 18, 2025 at 6:15 PM
Reposted by Nereide
Thank you! I’m trying to keep it classy.
Yours was the most polite mic drop I’ve ever seen in astronomy.🎤
November 19, 2025 at 2:17 AM
Reposted by Nereide
Thanks to Chris Young at Interesting Engineering for the chance to contextualize 3I/ATLAS. I would have preferred two thumbnails of the comet itself, but... enjoy.
interestingengineering.com/space/3i-atl...
3I/ATLAS: A city-sized alien spacecraft or simply the ‘coolest comet’ ever seen?
Harvard professor Avi Loeb claims 3I/ATLAS could be an alien spacecraft. Arizona State University professor Steven Desch is sure it isn't.
interestingengineering.com
November 18, 2025 at 8:49 PM
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I was browsing through NASA’s Photojournal archive when I found this historic image of Saturn, taken by Voyager 2 on Aug. 11, 1981.

The spacecraft was about 14.7 million kilometres away when the picture was captured.

Image credit: NASA/JPL

➡️ science.nasa.gov/photojournal...

🔭 🧪 #histsci

1/5
November 18, 2025 at 6:15 PM
Reposted by Nereide
A new 3D map of interstellar dust with Gaia! 🌌

A new study, led by Marie Barbillon, exploited the spectroscopic parametriser from Gaia DR3 to build a high-resolution extinction map! It extends up to 4 kpc from the Sun, with a finer version focused on the Local Bubble area.

#astro #galactic
November 18, 2025 at 9:35 AM
Reposted by Nereide
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Admire the extraordinary view of Pluto's nightside!

It stares back at us from the outer reaches of the Kuiper Belt in a view we’ll never forget.

Credits: NASA, Johns Hopkins Univ./APL, Southwest Research Institute

➡️ apod.nasa.gov/apod/ap24111...

🔭 🧪 #planetsci #histsci #science

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November 16, 2025 at 4:45 PM
Reposted by Nereide
I haven't been very active here for several months, because I've been working on a new book. Soon I will be able to tell you about it. Is anyone out there interested?
November 17, 2025 at 8:57 AM
Reposted by Nereide
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This intriguing picture by Stephen Kennedy shows a vast nebula complex recalling a shark, and so commonly referred to as the Shark Nebula.

➡️ apod.nasa.gov/apod/ap23061...

It includes smaller dust nebulae such as LDN (Lynds Dark Nebula) 1235 and Van den Bergh 149 & 150.

🔭 🧪 #science

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November 15, 2025 at 4:08 PM
🧵
Admire the extraordinary view of Pluto's nightside!

It stares back at us from the outer reaches of the Kuiper Belt in a view we’ll never forget.

Credits: NASA, Johns Hopkins Univ./APL, Southwest Research Institute

➡️ apod.nasa.gov/apod/ap24111...

🔭 🧪 #planetsci #histsci #science

1/4
November 16, 2025 at 4:45 PM
🧵
This intriguing picture by Stephen Kennedy shows a vast nebula complex recalling a shark, and so commonly referred to as the Shark Nebula.

➡️ apod.nasa.gov/apod/ap23061...

It includes smaller dust nebulae such as LDN (Lynds Dark Nebula) 1235 and Van den Bergh 149 & 150.

🔭 🧪 #science

1/5
November 15, 2025 at 4:08 PM
Reposted by Nereide
A thread worth reading slowly.

It explains, clearly and straight to the point, why Loeb’s claims about #3I/ATLAS don’t hold up—not a matter of opinion, but of comet physics anyone can check.

The tail isn’t escaping gas, it’s dust pushed by solar radiation.

🔭 🧪 #science #comet ⚛️

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Avi Loeb's calculations about 3I/ATLAS are 100% wrong because he has never understood that dust in the tail(s) responds to solar radiation pressure. Solar wind shapes the ion tail. But the radiation pressure is about 1000 times larger than the solar wind ram pressure, for particles that feel it.
November 14, 2025 at 9:15 AM
Reposted by Nereide
I discovered this photo while scrolling through #APOD, and it stopped me cold.

Rodrigo Guerra’s extraordinary image captures 3 rare phenomena together:

- Venus at its maximum splendor
- intense zodiacal light
- a perfectly centered galactic bulge.

➡️ apod.nasa.gov/apod/ap21100...

🔭 🧪 #sciart 1/7
November 13, 2025 at 6:18 PM
A thread worth reading slowly.

It explains, clearly and straight to the point, why Loeb’s claims about #3I/ATLAS don’t hold up—not a matter of opinion, but of comet physics anyone can check.

The tail isn’t escaping gas, it’s dust pushed by solar radiation.

🔭 🧪 #science #comet ⚛️

1/2
Avi Loeb's calculations about 3I/ATLAS are 100% wrong because he has never understood that dust in the tail(s) responds to solar radiation pressure. Solar wind shapes the ion tail. But the radiation pressure is about 1000 times larger than the solar wind ram pressure, for particles that feel it.
November 14, 2025 at 9:15 AM
I discovered this photo while scrolling through #APOD, and it stopped me cold.

Rodrigo Guerra’s extraordinary image captures 3 rare phenomena together:

- Venus at its maximum splendor
- intense zodiacal light
- a perfectly centered galactic bulge.

➡️ apod.nasa.gov/apod/ap21100...

🔭 🧪 #sciart 1/7
November 13, 2025 at 6:18 PM
Reposted by Nereide
Absolutely breathtaking!

Pure wonder.

Thanks for sharing this magic.🌌✨🔭 🧪 ⚛️
I am on my way home to Toronto and the aurorae are absolutely phenomenal.

If you are anywhere in the northern half of the continent, get outside and look up! Or better still, put your camera on a 10 second exposure and point it up.
November 13, 2025 at 10:51 AM
Reposted by Nereide
🧵
Here is the Nebra sky disk, considered by some the oldest known illustration of the night sky.

The artifact was discovered near Nebra alongside several Bronze Age weapons and is linked to the Unetice culture, which thrived in parts of Europe...

➡️ apod.nasa.gov/apod/ap18031...

🔭 🧪 #histsci

1/4
November 11, 2025 at 8:44 PM
Absolutely breathtaking!

Pure wonder.

Thanks for sharing this magic.🌌✨🔭 🧪 ⚛️
I am on my way home to Toronto and the aurorae are absolutely phenomenal.

If you are anywhere in the northern half of the continent, get outside and look up! Or better still, put your camera on a 10 second exposure and point it up.
November 13, 2025 at 10:51 AM
Reposted by Nereide
Gaia will find ~120,000 exoplanets, mostly super-Jupiters!

From 2014–2025 at L2, it tracked >1B stars so precisely: a pinhead on the Moon from Earth!

Full data by 2030; first release predicts 7,500 planets.

Also: hypervelocity stars, quad systems & ancient galaxy merger remnants. 🔭 🧪 #science
When you repeatedly measure the positions of over a billion stars so accurately that you can see a star moving by an amount equal to the size of a pinhead on the Moon, as seen from Earth... you find amazing things!

It's great.

mathstodon.xyz/@johncarlosb...
John Carlos Baez (@[email protected])
Holy crap! The Gaia space telescope is expected to find 120,000 ± 22,000 planets orbiting other stars! Most will be super-Jupiters, because those are the easiest to find. But we'll know much more ...
mathstodon.xyz
November 12, 2025 at 9:36 AM
Gaia will find ~120,000 exoplanets, mostly super-Jupiters!

From 2014–2025 at L2, it tracked >1B stars so precisely: a pinhead on the Moon from Earth!

Full data by 2030; first release predicts 7,500 planets.

Also: hypervelocity stars, quad systems & ancient galaxy merger remnants. 🔭 🧪 #science
When you repeatedly measure the positions of over a billion stars so accurately that you can see a star moving by an amount equal to the size of a pinhead on the Moon, as seen from Earth... you find amazing things!

It's great.

mathstodon.xyz/@johncarlosb...
John Carlos Baez (@[email protected])
Holy crap! The Gaia space telescope is expected to find 120,000 ± 22,000 planets orbiting other stars! Most will be super-Jupiters, because those are the easiest to find. But we'll know much more ...
mathstodon.xyz
November 12, 2025 at 9:36 AM
Reposted by Nereide
#WorldScienceDay for Peace and Development.

Science lets us understand the wonderful universe we live in.

It allow us to find answers to emerging challenges so we can create a more just and fair global society.

🔭 🧪 ⚛️ #ScienceDay #Science

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November 10, 2025 at 4:12 PM
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Here is the Nebra sky disk, considered by some the oldest known illustration of the night sky.

The artifact was discovered near Nebra alongside several Bronze Age weapons and is linked to the Unetice culture, which thrived in parts of Europe...

➡️ apod.nasa.gov/apod/ap18031...

🔭 🧪 #histsci

1/4
November 11, 2025 at 8:44 PM
Reposted by Nereide
Interstellar comet 3I/ATLAS was born with different and more ancient chemistry, has been more irradiated, and is speeding toward the Sun faster compared to Solar System comets. It's got a unique personality. But since literally Day 1 it was recognized as a comet and has only ever done comety things.
November 10, 2025 at 6:29 PM
Reposted by Nereide
"Look again at that dot. That’s here. That’s home. That’s us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives."

― Carl Sagan, born 9 November 1934

Video Credit: @planetarysociety.bsky.social

#PaleBlueDot 🔭 🧪 #CarlSagan
November 9, 2025 at 6:21 PM