How dense is a white dwarf?White Dwarfs:A white dwarf star is all that remains of a star's core after it depletes the fuel used in nuclear fusion. At first, when the star runs out of hydrogen, it expands into a red dwarf while fusing larger elements. When they are gone, a smaller...
“But neutron stars are different – they are so dense that dark matter particles are much more likely to interact with the star. If dark matter particles do collide with neutrons in the star, they will lose energy and become trapped. Over time, this would lead to an accumulation of ...
Stellar black holes are also created when two neutron stars, which are small, dense stars made of the core of dead stars, crash into each other, like bumper cars in space. The collision sends out a giant burst of radiation called a gamma-ray, as a new stellar black hole is formed. ...
Neutron, neutral subatomic particle that is a constituent of every atomic nucleus except ordinary hydrogen. It has no electric charge and a rest mass equal to 1.67493 × 10−27kg—marginally greater than that of the proton but nearly 1,839 times greater than that of the electron. What is ...
Lead is heavier, but it is so soft that it is useless in a penetrator -- lead would deform or disintegrate when the bomb hits the target. One material that is both extremely strong and extremely dense is depleted uranium. DU is the material of choice for penetrating weapons because of ...
{{B}}第二篇{{/B}}The function of an fMRI machine is A.to show how neutrons take in oxygen-rich bloodB.to measure how dense the blood is in the brainC.to identify which parts of the brain are processing informationD.to record how much oxygen the brain consumes 相关知识点: 试题来源...
After about a million years or so, a small, hot (1500 degrees Kelvin), dense core forms in the disc's center called a protostar. As gas and dust continue to fall inward in the disc, they give up energy to the protostar, which heats up more When the temperature of the protostar reach...
When matter falls into black holes, it tends to spiral in dense, extremely hot disks of gas first. This gas gets hot enough that it radiates in the x-ray spectrum (the hotter something is, the bluer the light it emits and x-rays are… way to blue to see). Under i...
Functions of this form are often used as models to describe the density profile of dense stellar clusters. For black holes the spin can be characterized via the angular momentum parameter a=J/Mc, where J is the angular momentum and M the mass of the black hole. It has the dimension of ...
Neutron stars, the incredibly dense remnants of massive stars, and pulsars, which emit beams of radiation like cosmic lighthouses. Each type evokes a different image, a different feeling, and each requires a slightly more nuanced description. And it’s not just about t...