Considerations 2.0

The recent much-hyped release of The Social Network, the semi-biopic of Facebook founder Mark Zuckerberg, has sparked a lot of discussion about the world’s favourite social media site, and about social networking in general. Despite social networking being thoroughly entrenched in millions of lives all over the world, many smart people remain entirely unconvinced.

This week, the fantastic British author Zadie Smith wrote a thoughtful piece on The Social Network, the film as well as the phenomenon, in which she argues that social networking reduces the richness of  human life and relationships. In The Atlantic, Alexis Madrigal writes an excellent response, invoking the human capacity to imagine and reinflate the information we transmit in bits and bytes.

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Gliese 581 g: The Goldilocks that isn’t?

ResearchBlogging.orgThe discovery of planet Gliese 581 g, an exoplanet just 3 times the mass of our Earth  and located in its host star’s Habitable Zone, was one of the biggest science headlines of the year. The news broke, typically, somewhere between my observing proposal deadline and box number 15: “all the crap that didn’t fit into boxes 1-14″, and by the time I’d read the story the internets was awash with all the details already.

As it turns out, I’m glad I haven’t written about it yet, as the story just got a little bit more interesting. With the headline still hot on the media’s most-read lists, astronomers from the Geneva exoplanet group have this week cast doubt on the discovery. Using data of GJ581 from the HARPS spectrograph at  the ESO 3.6-m telescope at La Silla, the instrument par excellence for planet hunting by radial velocities, they haven’t been able to confirm or reject the Californians’ findings, obtained with the HIRES spectrograph on Keck.

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Spreading Galaxies Gospel on Facebook

Galaxy rotation curves: NOT flat (Noordermeer et al, 2007)

ResearchBlogging.org

Paolo Salucci has a bone to pick with the community. The Trieste-based astronomer is fed up with his colleagues’ misconceptions about galaxy rotation curves and has decided to Do Something About It. In his short paper posted to astro-ph last Friday, he describes the experiment he’s set up to convince the world that galaxy rotation curves are not flat (oh sorry, that’s: NOT flat) – he has set up a Facebook group with plots, background, links and discussion, to orchestrate a change in the hearts and minds of astronomers around the world, to stamp out once and for all the damaging “hoax” of flat galaxy rotation curves.

Rotation curves describe how the rotation velocity in galaxies changes with increasing distance from the galactic centre. For spiral galaxies these curves are useful for learning about the galaxies’ matter distribution and, importantly, the presence of dark matter. But I’m not going to talk about rotation curves – it’s not my field and I’m happy to accept that they’re not flat.

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