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LIGO Orrery
A visualization of black hole merging events LIGO has detected
space  science  astronomy  ligo  gravity  blackhole  tootme 
2 days ago by nelson
Morse–Smale system - Wikipedia
In dynamical systems theory, an area of pure mathematics, a Morse–Smale system is a smooth dynamical system whose non-wandering set consists of finitely many hyperbolic equilibrium points and hyperbolic periodic orbits and satisfying a transversality condition on the stable and unstable manifolds. Morse–Smale systems are structurally stable and form one of the simplest and best studied classes of smooth dynamical systems. They are named after Marston Morse, the creator of the Morse t...
dblooper  math  gravity 
3 days ago by colindocherty
If We Blow Up an Asteroid, It Might Put Itself Back Together
Despite what Hollywood tells us, stopping an asteroid from creating an extinction-level event by blowing it up may not work.
In a simulation, material smashed away from an asteroid following a collision is attracted back to the object by its gravity.CreditBy Charles El Mir/johns Hopkins University

Faced with the prospect of a sizable asteroid heading toward Earth and causing doomsday, humanity has come up with various responses.

Hollywood may reckon that the best way to destroy an errant space rock is with nuclear weapons. This is rarely the preferred option of experts, but using some sort of spacecraft system to smash an asteroid into small, harmless pieces is seen as a real-world possibility. A new study, looking at a gigantic space rock-on-space rock clash, hints at how utterly ineffective this type of asteroid assassination attempt may be.

Using computer models, scientists simulated a 4,000-foot asteroid smashing into a 15.5-mile asteroid at 11,200 miles per hour. Immediately after colliding, the large asteroid cracked considerably, with debris flowing outward like a cascade of Ping-Pong balls. Despite some deep fractures, the heart of the asteroid was not comprehensively damaged.
asteroid  science  space  research  gravity  physics  from instapaper
13 days ago by jtyost2
Feynman Checkerboard as a Model of Discrete Space-Time
- In 1965, Feynman[1] wrote of using a lattice containing one dimension of space and one dimension of time to derive aspects of quantum mechanics. Feynman wrote that "This is a very amusing result, because it gives the complete statistical behavior of a quantum mechanical system as a path integral without the appearance of the ubiquitous i so characteristic of quantum mechanics." (p. 276.)

- Instead of summing the behavior of all possible paths as he did, this paper will consider th...
physics  gravity  space  dblooper 
14 days ago by colindocherty

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