Physics

Through a sensor, clearly: Complex systems made observable

(Phys.org) —A complex system can, in principle, be observable – that is, the system's complete internal state can be reconstructed from its outputs, which would ostensibly involve describing in complete quantitative detail all of its internal state variables at once. In an actual experiment, however, such measurement is typically beyond our reach, and so is limited to a smaller number of those variables. Referred to as sensors (or sensor nodes), these key variables can be used to make the complete system observable.

NASA Mission Helps Craft 3-D Image Of Buried Mars Flood Channels

NASA's Mars Reconnaissance Orbiter (MRO) has provided images allowing scientists for the first time to create a 3-D reconstruction of ancient water channels below the Martian surface.

NASA TV Briefing Discusses Curiosity Rover Analysis of Mars Rock

NASA will hold a news conference at 1 p.m. EDT, Tuesday, March 12, to discuss the Curiosity rover's analysis of the first sample of rock powder ever collected on Mars.

NASA, Lockheed Martin Announce Exploration Design Challenge for Students

NASA and Lockheed Martin Corp. of Bethesda, Md., will involve students in the flight test of NASA's Orion spacecraft through an Exploration Design Challenge to be unveiled in Houston on Monday, March 11.

NASA, Lockheed Martin Announce Exploration Design Challenge for Students

NASA and Lockheed Martin Corp. of Bethesda, Md., will involve students in the flight test of NASA's Orion spacecraft through an Exploration Design Challenge to be unveiled in Houston on Monday, March 11.

NASA Briefing Highlights Expedition 36-37 Space Station Crew

NASA's Johnson Space Center in Houston will host a crew news conference at 1 p.m. CDT (2 p.m. EDT) Tuesday, March 19, to preview the May launch of an American, an Italian and a Russian to the International Space Station.

NASA TV Coverage Planned For Space Station Soyuz Landing

NASA Television will provide live coverage March 13-15 as three crew members aboard the International Space Station end almost five months at the orbiting laboratory.

Particle looking 'more and more' like Higgs, LHC scientists say

The subatomic particle whose discovery was announced amid much fanfare last year, is looking "more and more" like it could indeed be the elusive Higgs boson believed to explain why matter has mass, scientists said Wednesday.

Probing extreme matter through observations of neutron stars

Neutron stars, the ultra-dense cores left behind after massive stars collapse, contain the densest matter known in the Universe outside of a black hole. New results have provided one of the most reliable determinations yet of the relation between the radius of a neutron star and its mass. These results constrain how nuclear matter – protons and neutrons, and their constituent quarks – interact under the extreme conditions found in neutron stars.

Curtains down for the black hole firewall paradox: Making gravity safe for Einstein again

Research by scientists at the University of York has revealed new insights into the life and death of black holes.

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