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... Science Frontiers ONLINE No. 67: Jan-Feb 1990 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Direct observations of hyperion's chaotic motion Hyperion is a 150-kilometer-diameter satellite of Saturn. Hyperion's irregular shape and the gravitational pull of Titan, a larger satellite of Saturn, make it a prime candidate for chaotic motion. After accumulating 53 Hyperion-days of observation, J. Klavetter has confirmed this theoretical suspicion. Hyperion's brightness varies wildly from day to day, as it spins unpredictably. The laws of motion and the largest computers are helpless here; although computer simulation can identify situations where chaos might develop. More alarmingly, some "subtle" chaos also appears in computer simulations of Pluto's motion and "perhaps other planets." (Kerr, Richard A.; "First Direct View of Solar System Chaos," Science, 246: 998, 1989.) Comment. Contemplate what might happen -- or might have happened already -- if any of the other planets moved chaotically. From Science Frontiers #67, JAN-FEB 1990 . 1990-2000 William R. Corliss ...
Terms matched: 1 - Score: 118 - 15 May 2017 - URL: /sf067/sf067a05.htm
... Science Frontiers ONLINE No. 67: Jan-Feb 1990 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology New world culture old Fantastic claim by explorer Archeological riddle The ancient-humans-in-europe controversy Astronomy Direct observations of hyperion's chaotic motion A NEW QUASAR DISTANCE RECORD: A NEW EMBARRASSMENT Explaining lunar flashes with life-savers Astronomers up against the "great wall" Biology Dna on cell surfaces Really-deep rivers Geology We live atop a chemical retort Australasian tektites coughed up by a moon of jupiter? Microorganisms complicate the k-t boundary Continuity at the conrad discontinuity Geophysics Eyewitness account of cropcircle formation Possible ball lightning in ankara Psychology Solar activity and bursts of human creativity Geomagnetic activity related to mental activity Psychotherapy may delay cancer deaths Physics A WATCHED ATOM IS AN INHIBITED ATOM General A HUNGARIAN UFO ...
Terms matched: 1 - Score: 15 - 15 May 2017 - URL: /sf067/index.htm
... Science Frontiers ONLINE No. 58: Jul-Aug 1988 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Chaotic Dynamics In The Solar System The following abstract appeared in a 1988 issue of Eos, a weekly publication of the American Geophysical Union. "Newton's equations have chaotic solutions as well as regular solutions. The solar system is generally perceived as evolving with clockwork regularity, yet there are several physical situations in the solar system where chaotic solutions of Newton's equations play an important role. There are physical examples of both chaotic rotation and chaotic orbital evolution. "Saturn's satellite Hyperion is currently tumbling chaotically, its rotation and spin axis orientation undergo significant irregular variations on a time scale of only a couple of orbit periods. Many other satellites in the solar system have had chaotic rotations in the past. It is not possible to tidally evolve into a synchronous rotation without passing through a chaotic zone. For irregularly shaped satellites this chaotic zone is attitude-unstable and chaotic tumbling ensues. This episode of chaotic tumbling probably lasts on the order of the tidal despinning timescale. For example, the Martian satellites Phobos and Deimos tumbled before they were captured into synchronous rotation for a time interval on the order of 10 million years and 100 million years, respectively. This episode of chaotic tumbling could have had a significant effect on the orbital histories of these satellites." Theis abstract continues, naming as other candidates for chaotic histories: some of the asteroids, Miranda (a satellite of Uranus), and the planet Pluto. ...
Terms matched: 1 - Score: 14 - 15 May 2017 - URL: /sf058/sf058a06.htm
... Lacertae) AQO QUASAR MORPHOLOGY AND COMPONENT DYNAMICS AQO1 Quasar Fuzz: What Is It? AQO2 Anomalies of Quasar Radio-Jet Structures AQO3 Superluminal Velocities in Quasars AR SATURN ARF SATURN'S INTRINSIC RADIATION ARF1 The Saturn Electrostatic Discharges (SEDs) ARF2 Measurements of Saturn's Intrinsic Energy ARF3 Sudden, Temporary Cessation of Radio Emissions ARL SATELLITE AND RING ANOMALIES ARL1 Pre-Spacecraft Observations of Extra Rings ARL2 Knots in Saturn's Rings When Viewed Edgewise ARL3 Bright Spot on Saturn's Rings ARL4 Anomalous Shadows of the Planet on the Rings ARL5 Dark Spokes in the Rings of Saturn ARL6 Kinked and Inhomogeneous Rings ARL7 Dark-Sided Iapetus ARL8 Titan's Variable Brightness ARL9 Changes in Saturn's Rings Observed within Historical Times ARL10 The "Gaps" between the Rings ARL11 Ring Asymmetries and Eccentricities ARL12 Hyperion's Chaotic Rotation ARL13 Irregular Density Trend of Saturn's Moons ARL14 Fine Structure of Saturn's Rings ARL15 Varying Crater Densities on Saturn's Moons ARL16 Youthful Features of Saturn's Rings AS THE SUN ASF SOLAR-RADIATION ANOMALIES ASF1 Large Changes in Solar-Flare Activity ASF2 Periodicity of Solar Cosmic Rays ASF3 The "Missing" Solar Neutrinos ASF4 Large Variations in Isotopes Implanted by the Solar Wind ASF5 155-Day Periodicity in Solar Flares ASF6 Implication of Solar-Wind Implanted Noble Gases ASO ANOMALOUS OBSERVATIONS OF THE SUN ASO1 Transient Dark Regions on the Sun ASO2 Remarkable Coronas ASO3 Bulges on the Solar Limb ASO4 Evidence of Past Prolonged Minima in Solar Activity ASO5 Short-Term Periodicities in Sunspot Numbers ASO6 Solar Oblateness and Quadrupole Moment ASO7 Changes in the Rate of Solar Rotation ASO8 Changes ...
Terms matched: 1 - Score: 5 - 15 May 2017 - URL: /cat-astr.htm
