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Paul R. Estrada

@drpaulestrada.bsky.social

670 followers 154 following 1.2K posts

Planetary Scientist - Early history and evolution of protoplanetary disks; origins and dynamics of gas and ice giant rings and moons; father to teens; Australian Shepherd(s) dad.

Posts Replies Media

Paul R. Estrada @drpaulestrada.bsky.social · 28/06/2026

Please post this on Truth Social.

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Paul R. Estrada @drpaulestrada.bsky.social · 30/05/2026

threads.com

Eliot Jacobson (@eliotjacobson) on Threads

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Paul R. Estrada @drpaulestrada.bsky.social · 04/04/2026

About this picture. Lot's going on here: 1) This is the nightside. The Earth is illuminated by the Moon. Moonlight is slightly red-shifted due to the Moon's surface composition. 2) The Sun is eclipsed by Earth. That sliver on the bottom right is the only part of the Earth in sunlight. 1/3

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Paul R. Estrada @drpaulestrada.bsky.social · 04/04/2026

I've noticed (maybe not so much on BlueSky, but certainly other social media) people posting some version of these pictures and asking why they look so different. The illumination sources for these images are different. Left is the Sun. Right, the Moon. The Sun is being eclipsed by Earth.

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Paul R. Estrada @drpaulestrada.bsky.social · 01/10/2025

On the other hand, this guy could be duping all of you.

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Paul R. Estrada @drpaulestrada.bsky.social · 11/09/2025

For those who would like a sense of the meaning of today's NASA presser on the Mars discovery, here is an excellent take from a colleague.

seti.org

Mars Discovery Raises Compelling Questions: Life or Chemistry

Results from NASA’s Perseverance rover presented this morning in a NASA press conference show the presence of organic molecules, unusual minerals, and strange textures inside Jezero’s ancient lakebed ...

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Paul R. Estrada @drpaulestrada.bsky.social · 06/04/2025

Literally!

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Paul R. Estrada @drpaulestrada.bsky.social · 27/12/2024

Image of the super giant star Antares, at a distance of 555 light years, taken with the Very Large Telescope Interferometer (VLTI) in Chile. The tiny dot on the bottom left would be roughly the size of the Sun. At only ~15 Myr old, these stars live fast and die hard (supernova).

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Paul R. Estrada @drpaulestrada.bsky.social · 05/12/2024

JWST image of Uranus and it's rings AND inner moons. Clockwise are Rosalind, Puck, Belinda, Desdemona, Cressida, Bianca, Portia, Juliet and Perdita in the most tight orbital configuration known. Subject to chaos as a result, their collisions possibly supply ring material on ~million yr timescales.

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Paul R. Estrada @drpaulestrada.bsky.social · 16/11/2024

Yes, Saturn's ring do cast shadows on the surface. Cassini image taken in 2005. Mimas and Tethys are visible. Incidentally, the rings are about half the mass of Mimas (that smaller dot), but have a surface area about 10000-100000 times that of Mimas (and are only 10's of meters thick).

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