How long does it take light to get out from the inside of the Sun?

The interior of the sun is a seathing plasma with a central density of over 100 grams/cc. The atoms, mostly hydrogen, are fully stripped of electrons so that the particle density is 10^26 protons per cubic centimeter. That means that the typical distance between protons or electrons is about (10^26)^1/3 = 2 x 10^-9 centimeters. The actual 'mean free path' for radiation is closer to 1 centimeter after electromagnetic effects are included. Light travels this distance in about 3 x 10^-11 seconds. Very approximately, this means that to travel the radius of the Sun, a photon will have to take (696,000 kilometers/1 centimeter)^2 = 5 x 10^21 steps. This will take, 5x10^21 x 3 x10^-11 = 1.5 x 10^11 seconds or since there are 3.1 x 10^7 seconds in a year, you get about 4,000 years.

@CosmicWanderings

🌟 Neutron stars are extremely dense, with a mass equivalent to that of the Sun, but a radius of only about 10 km.

💥 They are formed from the collapsed cores of massive stars that have gone supernova.

🔥 Neutron stars have incredibly strong gravitational fields, with surface gravitational acceleration about a billion times that of Earth.

🌀 They have extremely strong magnetic fields, trillions of times stronger than Earth's.

🌀 Neutron stars can rotate at incredibly fast rates, with some neutron stars known to rotate hundreds of times per second.

🔥 They emit intense radiation, including X-rays and gamma rays, due to their intense magnetic fields.

🔥 Some neutron stars emit pulses of radiation, known as pulsars, which can be used for a variety of astronomical studies.

🔥 Neutron stars can have surface temperatures of millions of degrees, making them visible in X-rays.

🌌 They can have strong gravity and magnetic fields, which can cause intense distortions of space-time.

🌌 Neutron stars can merge with other neutron stars or black holes, creating extreme gravitational waves, which can be detected by LIGO and Virgo.

@CosmicWanderings

Empty space is not truly empty. Even in the vacuum of outer space, there are still particles popping into and out of existence. This phenomenon is known as quantum fluctuation and arises due to the uncertainty principle of quantum mechanics.

@CosmicWanderings

Empty space is not silent. While sound cannot travel through a vacuum, there are still electromagnetic waves present, such as those from cosmic radiation, that can be detected by sensitive instruments.

@CosmicWanderings

Empty space is vast. The observable universe is estimated to be around 93 billion light-years in diameter, with billions of galaxies and trillions of stars within it. However, the vast majority of this space is empty, with only a tiny fraction occupied by matter.

@CosmicWanderings

Empty space is not static. The fabric of space-time is constantly changing, stretching and warping due to the presence of matter and energy. This phenomenon is known as the curvature of space-time, and it plays a crucial role in our understanding of gravity.

@CosmicWanderings

Empty space is intimately connected to the behavior of matter. The properties of empty space, such as its energy density, affect the behavior of particles and fields that occupy it. This relationship between empty space and matter is central to our understanding of the physical universe.

@CosmicWanderings

The astro-inertial navigation system of the SR-71 worked by tracking the stars through a circular quartz glass window on the upper fuselage. Its "blue light" source star tracker, which could see stars during both day and night.

@CosmicWanderings