JoAnne Hewett, Professor at SLAC, Stanford University Extra dimensions of space may be present in our universe. Their discovery would dramatically change our view of the cosmos and would prompt many questions. How do they hide? What is their shape? How many are there? How big are they? Do particles and forces feel their presence? This lecture will explain the concept of dimensions and show that current theoretical models predict the existence of extra spatial dimensions which could be in the discovery reach of present and near-term experiments. The manner by which these additional dimensions reveal their existence will be described. Watch video

02/05/2008 - The Hunt for Hidden Dimensions

These videos are recorded at the SETI Institute.

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Ross A. Beyer, SETI Institute and NASA AmesGoogle, Inc., has released Google Earth 5.0 which contains a Mars 3D mode. Working with engineers at Google, we helped collect, parse, and organize the vast store of Mars geospatial data available to the public into a form that could be used by Google Earth. The Mars mode presents data acquired both from orbit and on the surface, presented fully integrated into the Google Earth geospatial browser. Ross will cover a brief history of the project, take you on a detailed tour of all of the features, and answer your questions about using Mars mode for science, education, or fun, as well as answering questions about how to view your own data in the client. The team behind this talk includes NASA Ames engineers Matt Hancher and Michael Broxton. play video

03/04/2009 - Google Earth, now with Mars!

Scott Sandford, NASA Ames Space Science DivisionThe Stardust mission successfully returned samples from Comet Wild 2 in 2006. Studies of these samples have confirmed the presence of organics, some of which appear to be similar to those found in meteorites and some of which looks unlike anything seen in extraterrestrial materials before. The presence of D and 15N excesses in many of the organics suggests they have an interstellar chemical heritage. The nature of these organics, and their possible relationship to interstellar environments will be discussed.play video

02/25/2009 - Interstellar and Early Solar System Organics in Samples from Comet Wild 2

Franck Marchis, UC Berkeley and the SETI Institute Since the discovery of Ida’s companion Dactyl in 1993, the number of known multiple asteroids has been continuously increasing and ~165 of them are now known. Since 2003, Dr. Marchis and his colleagues have been conducting a large survey of these interesting and diverse populations using various ground-based telescopes and techniques, such as high angular resolution imaging, lightcurve photometry, and VIS/NIR spectroscopy, and also the Spitzer and Hubble space telescopes. Dr. Marchis ' talk will cover the latest insights into these multiple systems, such as the sizes and shapes of their components, their bulk-density and their orbital parameters, which are key to understanding how they formed and evolved. play video

02/18/2009 - Multiple Asteroid Systems: New Techniques to Study New Worlds

Dr. Jack Lissauer, Space Sciences Division, NASA Ames Research Center The observed properties of giant planets, models of their evolution, and observations of protoplanetary disks all provide constraints on the formation of gas giant planets. The four largest planets in our Solar System contain considerable quantities of hydrogen and helium, which could not have condensed into solid planetesimals within the protoplanetary disk. The preponderance of evidence supports the core nucleated gas accretion model of formation of the giant planets. According to this model, giant planets begin their growth by the accumulation of small solid bodies, as do terrestrial planets. However, unlike terrestrial planets, the growing giant planet cores become massive enough that they are able to accumulate substantial amounts of gas before the protoplanetary disk dissipates. During this talk, Dr. Lissauer will present the first models of giant planet formation that account for both the planet's internal energy budget and gas flows within the protoplanetary disk. play video

10/29/2008 - Giant Planet Formation

Ron Greeley, Regent's Professor, Arizona State University Windblown dunes, ripples, and erosional features are seen on Earth, Venus, and Titan, while on Mars these features are ubiquitous and reflect the dominant agent of surface modification. Although the fundamental process is similar, the environments on these planetary objects are substantially different. Simulations conducted in the Planetary Aeolian Laboratory at NASA-Ames, coupled with field work and modeling, enable analyses of wind-related features and processes on planetary surfaces. play video

02/05/2008 - The Hunt for Hidden Dimensions

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