Astro Wonders

2021-05-06 15:49:08 In solids, atoms do not vibrate independently, but the oscillations are transmitted through the substance as acoustic waves of extremely high frequency ( typically of the order of a trillion Hz). The energy transmitted by the waves is quantized, just like in the case of electromagnetic waves. The quantum of these lattice waves is called a photon and has a value hf, where h is Planck's constant and f is the frequency.

This may sound familiar to a photon, the quantum of light, but there are differences. Phonons exist only in systems with atoms to vibrate. They are not elementary particles. On the other hand, photons are elementary particles of the Standard Model.

Photons have a single dispersion relation (their energy and momentum are always proportional). Phonons, in contrast, have two dispersion relations (optical and acoustic).

@thewonderofspace Open / Comment

2021-05-06 11:00:15 NASA's Parker Solar Probe has once again broken two monumental records, making it one of the important probes to have been sent on space.
On Thursday, Apr. 29, the solar orbiter had slingshot its way towards the Sun while traveling at an unimaginable record-breaking speed enough to circle the Earth 13 times in an hour.

The last records set by the solar probe were made on February 2020, when it flew at a speed of 244,255 mph (393,044 km/h) and had come within 11.6 million miles (18.6 million kilometers) around the Sun's surface.
But this time, the solar orbiter had come within around 6.5 million miles (10.4 million kilometers) of the Sun's surface while moving at a blazing speed of 330,000 miles per hour (532,000 kilometers per hour).

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2021-05-06 05:30:00 Blue Origin has unveiled plans to fly astronauts on their NewShepard launch system NET July 20th.

One seat will be taken by the winning bidder of an online auction on the company’s website.

https://www.blueorigin.com/

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2021-05-05 20:36:27 ​​Mathematics is all around us, and it has shaped our understanding of the world in many ways. In 2013, mathematician and science author IanStewart published a book on "17 Equations That Changed The World."

And here I am presenting a little bit more (in a very different way) about these wonderful equations that have shaped Mathematics, Physics and human history. These 17 equations are arranged into chronological order.

Here is the first one, The Pythagorean Theorem (or Pythagoras's Theorem)

Over 2000 years ago there was an amazing discovery about triangles :- When a triangle has a right angle (90°) ... and squares are made on each of the three sides, ...then the biggest square has the exact same area as the other two squares put together! (Look the image in comment section).

This theorem is foundational to our understanding of geometry. It describes the relationship between the sides of a right triangle on a flat plane. it is one of the most well known mathematical theorems in the world. Open / Comment

2021-05-05 20:34:51 ​​Logarithms --

Logarithms helped us perform tedious calculations before there were calculators. When we talk about tiny and gigantic things, we always use logarithms such as; our sensitivity to light, earthquake magnitudes, noise levels in decibels, acidity (pH) money growing with a fixed interest rate, bacteria growing in a petri dish, radioactive decay.

History:- The method of logarithms was publicly propounded by #JohnNapier in 1614, in a book titled Mirifici Logarithmorum Canonis Descriptio (Description of the Wonderful Rule of Logarithms). Around 1730, #LeonhardEuler extended & connected logarithms to the exponential function.

Modern definition & explanation:- Logarithms are the inverses, or opposites, of exponential functions. A logarithm for a particular base tells us what power we need to raise that base to to get a number. For example, the base 10 logarithm of 1 is log(1) = 0, since 1 = 10^0; log(10) = 1, since 10 = 10^1; and log(100) = 2, since 100 = 10^2 (look the second equation in the graphic)

The first equation in the graphic, log(ab) = log(a) + log(b), shows one of the most useful applications of logarithms: they turn multiplication into addition. Open / Comment

2021-05-05 16:17:29 Kepler's Laws of Planetary Motion Open / Comment

2021-05-05 11:00:10 ETA AQUARIDS

Night sky observers will have a special treat this week: debris from Halley’s Comet’s tail will set the stage for a meteor shower which should delight the naked eye with streaks of shooting stars. According to NASA, Eta Aquarid meteors are known for their speed. Traveling at about 148,000 mph into the Earth’s atmosphere, fast meteors can leave glowing “trains” which last for several seconds to minutes. These trains are really incandescent bits of debris in the wake of the meteor. In general, 30 Eta Aquarid meteors can be seen per hour during their peak.

don’t expect to see Halley’s Comet itself for a while. Halley takes about 76 years to orbit the sun once. The last time Halley was seen by casual observers was in 1986; it won’t enter the inner solar system again until 2061.

While the comet won’t be on display for another 40 years, the Eta Aquarids should put on a good show around Earth.

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2021-05-05 05:30:00 How Stars Explode

Scientists have found fragments of titanium blasting out of a famous supernova. This discovery, made with NASA's Chandra X-ray Observatory, could be a major step in pinpointing exactly how some giant stars explode.
This work is based on Chandra observations of the remains of a supernova called Cassiopeia A, located in our galaxy about 11,000 light-years from Earth. This is one of the youngest known supernova remnants, with an age of about 350 years.

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