Category: Uncategorized

Let’s end this political hangover. It is time to fight

It was a tough night … one in which any dreams we may have had of “American exceptionalism” were crushed. Instead of serving, as it has so nobly, for more than two centuries as a beacon of hope and light to ...

The spire in Eberswalde crater

A Piece of Mars: OK, you have to bring out the red/blue glasses for this one. (Or click here if you're missing your glasses and want the black and white version.) Eberswalde crater has some lovely layered deposits, long ago ...

Calling for a Better World – Remember to Vote

In English Another attack this month, this time in Nice in the middle of the 14 July celebrations. First, the obvious: this attack, which targeted people and families watching fireworks, was despicable and inhuman. Of course, I send my thoughts to ...

GPI at 2016 SPIE Astronomical Telescopes and Instrumentation

GPI is here at the SPIE Astronomical Telescopes and Instrumentation conference in Edinburgh, Scotland to talk exoplanets and engineering with our colleagues around the world. We have had talks and posters by GPIES team members on topics from AO ...

20 years ago, I started my nomadic life, I have no regrets

Something personal today... Twenty years ago today, without putting too many thoughts and with the bare minimum of preparation, I left France, my native country, for an adventurous travel around the world. I had no idea where I was really going and ...

Neverending dust

A Piece of Mars: Some parts of Mars, like this one, are very dusty. This 1.92x1.1 km (1.2x0.67 mi) area has built up a thick deposit of dust that slowly buries the impact craters until they're mere ghosts of the ...

Flying through the binary trojan asteroid system (617) Patroclus

Another day, another video! This time I am posting a video of the binary L5 Trojan Asteroid (617) Patroclus-Menoetius. In collaboration, with the team at the California Academy of Sciences, we have created a model of this interesting binary asteroid system ...

Visiting the L4 Trojan Asteroid (624) Hektor

I finally started uploading some of the animations of the talk that I gave last month at the California Academy of Sciences. Today let's watch (624) Hektor, the binary and bilobed largest Jupiter-Trojan asteroids. This is a puzzling multiple asteroid ...

Sizes of worlds

A Piece of the Solar System: This isn't my usual sort of post. But lately my 6 year old kid has been into planets, and thanks to the many informative videos on YouTube, has been reciting various names and numbers ...

The smallest dunes

A Piece of Mars: There are two small dome-shaped dunes in this frame (0.96x0.54 or 0.6x0.33 mi). If they got any larger, they'd form slip faces. Any smaller and they'd just be random drifts of windblown sand. Dunes form at ...