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Guest blog for The Planetary Society

See my guest blog for The Planetary Society on the difference between ripples and dunes.

HiRISE image caption for Curiosity

A piece of Mars: Last week I wrote an image caption for Curiosity, showing both the HiRISE perspective and Curiosity's image of the ripple crossing Dingo Gap. Read more on the HiRISE image page.

Director of the Carl Sagan Center of the SETI Institute publishes a Carl Sagan Biographical Memoir

David Morrison, director of the Carl Sagan Center of the SETI Institute, has written a biographical memoir of Carl Sagan (1934-1996), founder of the modern disciplines of planetary science and exobiology. Morrison’s piece has been published in Biographical Memoirs, an online ...

It’s a comet! No, wait…

A piece of Mars: Is it a comet? With Comet ISON in the news these days it's hard to tell. No, this is a brand-new meteorite impact on the surface of Mars. The impactor hit the ground, blasted through a ...

Boulders on high

A piece of Mars: Right at the edge of the largest volcano on Mars (Olympus Mons) is a steep cliff. Here, near that edge, are some car-sized boulders poking out from a thick blanket of dust. Strong winds blow down ...

GPI First light: That someday… is Monday night.

For the last, oh, ten years or so I've been working on building a camera to take pictures of planets around distant stars, been lucky enough to be part of a team of the best damn astronomers I'm privileged to ...

Different day, different sand

A piece of Mars: Creamy dunes (or maybe they're very large ripples) wind their way northward between mesas. More recently darker, more mobile sand (bluish here) has piled up against the western slopes of the mesas. We don't know why ...

The International Space Orchestra is in space

I am delighted to announce that The International Space Orchestra (ISO) recordings from Skywalker ranch, George Lucas' studio was launched in space on 4th August on board of two ArduSat (satellites for which NanoSatisfi is the parent company). The lift ...

Thanks, Anna!

Screaming winds

A piece of Mars: This image is way up high on the Tharsis Montes on Mars, at an elevation of 5900 m (19,350 ft). At night the wind comes screaming down from some of the tallest mountains in the Solar ...