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The latest Messages 40
2022-08-24 06:33:52
PSR J1748−2446ad is the fastest-spinning pulsar known, at 716 Hz, or 716 times per second. This pulsar was discovered by Jason W. T. Hessels of McGill University on November 10, 2004 and confirmed on January 8, 2005. If the neutron star is assumed to contain less than two times the mass of the Sun, within the typical range of neutron stars, its radius is constrained to be less than 16 km. At its equator it is spinning at approximately 24% of the speed of light, or over 70,000 km per second.━━━━━━━━━━━━
@Physics | @Education
4.3K views03:33
2022-08-23 07:09:03
WEBB’S JUPITER IMAGES SHOWCASE AURORAS, HAZES
With giant storms, powerful winds, auroras, and extreme temperature and pressure conditions, Jupiter has a lot going on. Now, NASA’s James Webb Space Telescope has captured new images of the planet. Webb’s Jupiter observations will give scientists even more clues to Jupiter’s inner life.━━━━━━━━━━━━
@Physics | @Education
4.6K views04:09
2022-08-22 08:00:48
Artemis 1 (officially Artemis I) is a planned uncrewed test flight for NASA's Artemis program. It is the first flight of the agency's Space Launch System (SLS) super heavy-lift launch vehicle and the first flight of the full Orion spacecraft. Artemis 1 is currently scheduled to launch on 29 August 2022.
Formerly known as Exploration Mission-1 (EM-1), the mission was renamed following the creation of the Artemis program. The mission will lift off from Launch Complex 39B at the Kennedy Space Center, and will see an Orion spacecraft launched on a mission of between 26 and 42 days, with at least 6 of those days in a distant retrograde orbit around the Moon. The mission will certify Orion and the Space Launch System for crewed flights beginning with Artemis 2.
The Orion spacecraft for Artemis 1 was stacked on 20 October 2021, marking the first time a super heavy-lift vehicle has been stacked inside the Vehicle Assembly Building (VAB) since the final Saturn V with Skylab. The fully stacked vehicle was rolled out for launch on 17 August 2022.━━━━━━━━━━━━
@Physics | @Education
4.9K views05:00
2022-08-21 07:37:34
The photoelectric effect is the emission of electrons when electromagnetic radiation, such as light, hits a material. Electrons emitted in this manner are called photoelectrons. The phenomenon is studied in condensed matter physics, and solid state and quantum chemistry to draw inferences about the properties of atoms, molecules and solids. The effect has found use in electronic devices specialized for light detection and precisely timed electron emission.
The experimental results disagree with classical electromagnetism, which predicts that continuous light waves transfer energy to electrons, which would then be emitted when they accumulate enough energy. An alteration in the intensity of light would theoretically change the kinetic energy of the emitted electrons, with sufficiently dim light resulting in a delayed emission. The experimental results instead show that electrons are dislodged only when the light exceeds a certain frequency—regardless of the light's intensity or duration of exposure. Because a low-frequency beam at a high intensity does not build up the energy required to produce photoelectrons, as would be the case if light's energy accumulated over time from a continuous wave, Albert Einstein proposed that a beam of light is not a wave propagating through space, but a swarm of discrete energy packets, known as photons.━━━━━━━━━━━━
@Physics | @Education
5.1K views04:37
2022-08-20 04:31:41
Brownian motion, or pedesis, is the random motion of particles suspended in a medium (a liquid or a gas). This pattern of motion typically consists of random fluctuations in a particle's position inside a fluid sub-domain, followed by a relocation to another sub-domain. Each relocation is followed by more fluctuations within the new closed volume. This pattern describes a fluid at thermal equilibrium, defined by a given temperature. Within such a fluid, there exists no preferential direction of flow (as in transport phenomena). More specifically, the fluid's overall linear and angular momenta remain null over time. The kinetic energies of the molecular Brownian motions, together with those of molecular rotations and vibrations, sum up to the caloric component of a fluid's internal energy (the equipartition theorem).━━━━━━━━━━━━
@Physics | @Education
5.5K views01:31
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