Speed of the Milky Way in Space As we all know, a galaxy is a massive ensemble of hundreds of millions of stars. The galaxy where we live in today is called the Milky Way. The name itself came from the ancient Greek galaxies kyklos, or ring of milk, due to its faint milky appearance. Our Milky Way is a large spiral galaxy. Ever since four hundred years ago the settlement that the Earth is moving about the sun, and one hundred and fifty years ago that the sun is moving about the center of the Galaxy, it shouldn't be surprising if we learned that the Galaxy is also moving. In 1928, an American astronomer Milton La Salle Humason found a galaxy that was receding at a speed of 3,800 km/s, and by 1936, when he observed the same galaxy again, he found it receding at a speed of 40,000 km/s. If our galaxy exerted a repulsive force, that force should be felt with the local groups, however it wasn't. In conclusion, galaxies experience neutral attractions on one other. Patricia Kong -- 1999 Burstein, David.
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Laboratory Equipment Neutron star Neutron stars contain 500,000 times the mass of the Earth in a sphere with a diameter no larger than that of Brooklyn, United States A neutron star is a type of stellar remnant that can result from the gravitational collapse of a massive star during a Type II, Type Ib or Type Ic supernova event. Neutron stars are the densest and tiniest stars known to exist in the universe; although having only the diameter of about 10 km (6 mi), they may have a mass of several times that of the Sun. Neutron stars probably appear white to the naked eye. Neutron stars are the end points of stars whose inert core's mass after nuclear burning is greater than the Chandrasekhar limit for white dwarfs, but whose mass is not great enough to overcome the neutron degeneracy pressure to become black holes. The discovery of pulsars in 1967 suggested that neutron stars exist. Neutron star collision Formation Properties Gravitational light deflection at a neutron star. Given current values Structure
What Is a Black Hole? An artist's drawing a black hole named Cygnus X-1. It formed when a large star caved in. This black hole pulls matter from blue star beside it. A black hole is a place in space where gravity pulls so much that even light can not get out. The gravity is so strong because matter has been squeezed into a tiny space. Because no light can get out, people can't see black holes. How Big Are Black Holes? Another kind of black hole is called "stellar." An artist's drawing shows the current view of the Milky Way galaxy. The largest black holes are called "supermassive." How Do Black Holes Form? Stellar black holes are made when the center of a very big star falls in upon itself, or collapses. Scientists think supermassive black holes were made at the same time as the galaxy they are in. This image of the center of the Milky Way galaxy was taken by the Chandra X-ray Observatory. Image Credit: NASA/CXC/MIT/F.K. If Black Holes Are "Black," How Do Scientists Know They Are There? Image Credit:
How fast is our galaxy moving through space "The Milky Way and the Andromeda galaxy are approaching each other with a speed of 300,000 miles per hour." or 130 km/s As we all know, a galaxy is a massive ensemble of hundreds of millions of stars. Ever since four hundred years ago the settlement that the Earth is moving about the sun, and one hundred and fifty years ago that the sun is moving about the center of the Galaxy, it shouldn't be surprising if we learned that the Galaxy is also moving. In 1928, an American astronomer Milton La Salle Humason found a galaxy that was receding at a speed of 3,800 km/s, and by 1936, when he observed the same galaxy again, he found it receding at a speed of 40,000 km/s. If our galaxy exerted a repulsive force, that force should be felt with the local groups, however it wasn't. In conclusion, galaxies experience neutral attractions on one other.
Multi-Agent Transport Simulation | MATSim Optics, Lasers, Imaging & Fiber Information Resource Neutron Stars - Introduction Neutron stars are compact objects that are created in the cores of massive stars during supernova explosions. The core of the star collapses, and crushes together every proton with a corresponding electron turning each electron-proton pair into a neutron. The neutrons, however, can often stop the collapse and remain as a neutron star. Neutron stars are fascinating objects because they are the most dense objects known. Like their less massive counterparts, white dwarfs, the heavier a neutron star gets the smaller it gets. Neutron stars can be observed occasionally, as with Puppis A above, as an extremely small and hot star within a supernova remnant.
Black hole A black hole is defined as a region of spacetime from which gravity prevents anything, including light, from escaping. The theory of general relativity predicts that a sufficiently compact mass will deform spacetime to form a black hole. Around a black hole, there is a mathematically defined surface called an event horizon that marks the point of no return. The hole is called "black" because it absorbs all the light that hits the horizon, reflecting nothing, just like a perfect black body in thermodynamics. Quantum field theory in curved spacetime predicts that event horizons emit radiation like a black body with a finite temperature. This temperature is inversely proportional to the mass of the black hole, making it difficult to observe this radiation for black holes of stellar mass or greater. Objects whose gravity fields are too strong for light to escape were first considered in the 18th century by John Michell and Pierre-Simon Laplace. History General relativity
NASA finds extra-terrestrial amino-acids in Sudan meteorites Earlier this month, NASA announced the discovery of bacteria living in arsenic in a California lake. Now they have uncovered ET amino-acids in meteorite fragments that landed in northern Sudan. The meteorite was a fragment of a parent asteroid measuring 13-feet-wide (4m), and weighing 59-tons. Read more... Amino-acids have been found in carbon-rich meteorites before but this is the first time the acid substances have been found in a meteorite as hot as 2,000 Fahrenheit (1,100c).