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The latest Messages 9
2023-03-25 07:35:17
A meteoroid is a small rocky or metallic body in outer space.Meteoroids are defined as objects significantly smaller than asteroids, ranging in size from grains to objects up to a meter wide. Objects smaller than this are classified as micrometeoroids or space dust. Most are fragments from comets or asteroids, whereas others are collision impact debris ejected from bodies such as the Moon or Mars.
When a meteoroid, comet, or asteroid enters Earth's atmosphere at a speed typically in excess of 20 km/s (72,000 km/h; 45,000 mph), aerodynamic heating of that object produces a streak of light, both from the glowing object and the trail of glowing particles that it leaves in its wake. This phenomenon is called a meteor or "shooting star". Meteors typically become visible when they are about 100 km above sea level. A series of many meteors appearing seconds or minutes apart and appearing to originate from the same fixed point in the sky is called a meteor shower. A meteorite is the remains of a meteoroid that has survived the ablation of its surface material during its passage through the atmosphere as a meteor and has impacted the ground.━━━━━━━━━━━
@Physics | @Education
1.2K views04:35
2023-03-24 07:48:14
The imaging platform combines functional MRI with fibre photometry to study the daydreaming brain. Source: Click here
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@Physics | @Education
1.5K views04:48
2023-03-23 04:54:58
A comet is an icy, small Solar System body that warms and begins to release gases when passing close to the Sun, a process called outgassing. This produces an extended, gravitationally unbound atmosphere or coma surrounding the nucleus, and sometimes a tail of gas and dust gas blown out from the coma. These phenomena are due to the effects of solar radiation and the outstreaming solar wind plasma acting upon the nucleus of the comet. Comet nuclei range from a few hundred meters to tens of kilometers across and are composed of loose collections of ice, dust, and small rocky particles. The coma may be up to 15 times Earth's diameter, while the tail may stretch beyond one astronomical unit. If sufficiently close and bright, a comet may be seen from Earth without the aid of a telescope and can subtend an arc of up to 30° (60 Moons) across the sky. Comets have been observed and recorded since ancient times by many cultures and religions.━━━━━━━━━━━
@Physics | @Education
568 views01:54
2023-03-22 06:54:07
Winter solstice and Vernal Equinox
Picture Credits: Universe_of_Atharv
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@Physics | @Education
1.9K viewsedited 03:54
2023-03-21 06:00:11
New device has a switching speed that’s four to five orders of magnitude faster than current solid-state transistors. Source: Click here
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@Physics | @Education
1.6K views03:00
2023-03-20 06:41:57
A thyristor is a solid-state semiconductor device with four layers of alternating P- and N-type materials used for high-power applications. It acts exclusively as a bistable switch (or a latch) conducting when the gate receives a current trigger, and continuing to conduct until the voltage across the device is reverse-biased, or until the voltage is removed (by some other means). There are two designs, differing in what triggers the conducting state. In a three-lead thyristor, a small current on its Gate lead controls the larger current of the Anode to Cathode path. In a two-lead thyristor, conduction begins when the potential difference between the Anode and Cathode themselves is sufficiently large (breakdown voltage).━━━━━━━━━━━
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648 views03:41
2023-03-19 11:56:43
Imaging brain tissue oxygenation during radiotherapy using functional near-infrared spectroscopy could help to personalize cancer treatments. Source: Click here
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@Physics | @Education
761 viewsedited 08:56
2023-03-18 05:56:27
High-precision X-ray crystallography measurements could help design light-activated cancer drugs. Source: Click here
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@Physics | @Education
1.4K views02:56
2023-03-17 05:32:36
The Schottky diode (named after the German physicist Walter H. Schottky), also known as Schottky barrier diode or hot-carrier diode, is a semiconductor diode formed by the junction of a semiconductor with a metal. It has a low forward voltage drop and a very fast switching action. The cat's-whisker detectors used in the early days of wireless and metal rectifiers used in early power applications can be considered primitive Schottky diodes.━━━━━━━━━━━
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497 views02:32
2023-03-16 05:25:37
MRI guidance could improve brachytherapy treatments of locally advanced cervical cancer. Source: Click here
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@Physics | @Education
1.9K views02:25
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