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6 results tagged science x
  • How Earth’s Climate Changes Naturally (and Why Things Are Different Now) | Quanta Magazine
    Earth has been a snowball and a hothouse at different times in its past. So if the climate changed before humans, how can we be sure we’re responsible for the dramatic warming that’s happening today?

    In part it’s because we can clearly show the causal link between carbon dioxide emissions from human activity and the 1.28 degree Celsius (and rising) global temperature increase since preindustrial times.

    But paleoclimatologists have also made great strides in understanding the processes that drove climate change in Earth’s past. Here’s a primer on 10 ways climate varies naturally, and how each compares with what’s happening now.
    Wed 22 Jul 2020 02:36:07 PM +08 - permalink -
    - https://www.quantamagazine.org/how-earths-climate-changes-naturally-and-why-things-are-different-now-20200721/
    earth science
  • [1802.04718] The random walk of cars and their collision probabilities with planets
    On February 6th, 2018 SpaceX launched a Tesla Roadster on a Mars crossing orbit. We perform N-body simulations to determine the fate of the object over the next several million years, under the relevant perturbations acting on the orbit. The orbital evolution is initially dominated by close encounters with the Earth. The first close encounter with the Earth will occur in 2091. The repeated encounters lead to a random walk that eventually causes close encounters with other terrestrial planets and the Sun. Long-term integrations become highly sensitive to the initial conditions after several such close encounters. By running a large ensemble of simulations with slightly perturbed initial conditions, we estimate the probability of a collision with Earth and Venus over the next one million years to be 6% and 2.5%, respectively. We estimate the dynamical lifetime of the Tesla to be a few tens of millions of years.
    Sat 24 Feb 2018 02:21:41 PM +08 - permalink -
    - https://arxiv.org/abs/1802.04718
    paper probability research science space spacex tesla
  • Savoir, connaître, comprendre… | Le Webinet des Curiosités
    Un billet très intéressant sur la distinction profonde entre "savoir", "connaître" et "comprendre".
    Sun 16 Jun 2013 11:35:35 PM +08 - permalink -
    - http://webinet.cafe-sciences.org/articles/savoir-connaitre-comprendre/
    comprendre connaitre langage neuroscience philosophie savoir science webinet
  • Cosmography of the Local Universe
    The three-dimensional structure of the local universe may one day become as familiar as our local geography thanks to a new generation of maps that reveal our neighbourhood’s rich complexity and our place within it

    Helene Courtois at the University of Lyon in France and a few buddies show off this newfound knowledge in a movie (and accompanying paper) that they’ve created to explore the rich structure of our galactic neighbourhood.
    Wed 05 Jun 2013 05:30:24 PM +08 - permalink -
    - http://irfu.cea.fr/cosmography
    3d cosmos map science universe
  • New Science of Cosmography Reveals 3D Map of the Local Universe | MIT Technology Review
    The three-dimensional structure of the local universe may one day become as familiar as our local geography thanks to a new generation of maps that reveal our neighbourhood’s rich complexity and our place within it
    Wed 05 Jun 2013 05:29:27 PM +08 - permalink -
    - http://www.technologyreview.com/view/515746/new-science-of-cosmography-reveals-3d-map-of-the-local-universe/
    3d cosmos map science universe
  • Fraudez fort, fraudez Benford | Pourquoi Comment Combien
    Fabriquer des données comme des montants de fausses factures demande un certain doigté car il existe des tests statistiques permettant de mesurer leur vraisemblance. Le plus usité de ces tests consiste à vérifier que les données suivent la surprenante loi de Benford, qui dit que le chiffre le plus à gauche de données statistiques est plus souvent un 1 qu'un 2, plus souvent un 2 qu'un 3 et ainsi de suite jusqu'à 9.
    Sun 09 Dec 2012 12:44:06 PM +08 - permalink -
    - http://drgoulu.com/2012/12/07/fraudez-benford/
    benford goulu loi nombres probabilité science statistiques
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