Visualizing the Origin of Elements
Most of us are familiar with the periodic table of elements from high school chemistry. We learned about atoms, and how elements combine to form chemical compounds. But perhaps a lesser-known aspect is where these elements actually come from.
Today’s periodic table showing the origin of elements comes to us from Reddit user u/only_home, inspired by an earlier version created by astronomer Jennifer Johnson. It should be noted that elements with multiple sources are shaded proportionally to reflect the amount of said element produced from each source.
Let’s dive into the eight origin stories in more detail.
The Big Bang
The universe began as a hot, dense region of radiant energy about 14 billion years ago. It cooled and expanded immediately after formation, creating the lightest and most plentiful elements: hydrogen and helium. This process also created trace amounts of lithium.
Low Mass Stars
At the beginning of their lives, all stars create energy by fusing hydrogen atoms to form helium. Once the hydrogen is depleted, stars fuse helium into carbon and expand to become red giants.
From this point on, the journey of a low and a high mass star differs. Low mass stars reach a temperature of roughly one million kelvin and continue to heat up. Outer layers of helium and hydrogen expand around the carbon core until they can no longer be contained by gravity. These gas layers, known as a planetary nebula, are ejected into space. It is thought that a low mass star’s death creates many heavy elements such as lead.
Exploding White Dwarfs
In the wake of this planetary nebula expulsion, a carbon core known as a “white dwarf” remains with a temperature of about 100,000 kelvin. In many cases, a white dwarf will simply fade away.
Sometimes, however, white dwarfs gain enough mass from a nearby companion star to become unstable and explode in a Type 1a supernova. This explosion likely creates heavier elements such as iron, nickel, and manganese.
Exploding Massive Stars
Massive stars evolve faster and generate much more heat. In addition to forming carbon, they also create layers of oxygen, nitrogen, and iron. When the core contains only iron, which is stable and compact, fusion ceases and gravitational collapse occurs. The star reaches a temperature of over several billion kelvin—resulting in a supernova explosion. Astronomers speculate that a variety of elements, including arsenic and rubidium, are formed during such explosions.
Exploding Neutron Stars
When a supernova occurs, the star’s core collapses, crushing protons and neutrons together into neutrons. If the mass of a collapsing star is low enough—about four to eight times that of the sun—a neutron star is formed. In 2017, it was discovered that when these dense neutron stars collide, they create heavier elements such as gold and platinum.
Cosmic Ray Spallation
The shockwaves from supernova explosions send cosmic rays, or high energy atoms/subatomic particles, flying through space. When these cosmic rays hit another atom at nearly the speed of light, they break apart and form a new element. The elements of lithium, beryllium, and boron are products of this process.
Supernova explosions also create very heavy elements with unstable nuclei. Over time, these nuclei eject a neutron or proton, or a neutron decays into a proton and electron. This process is known as radioactive decay and often creates lighter, more stable elements such as radium and francium.
Not Naturally Occurring
There are currently 26 elements on the periodic table that are not naturally occurring; instead, these are all created synthetically in a laboratory using nuclear reactors and particle accelerators. For example, plutonium can be created when fast-moving neutrons collide with a common uranium isotope in a nuclear reactor.
Discoveries Yet to be Made
There is still some uncertainty as to where elements with a middle-range atomic number—neither heavy nor light—come from. As scientific breakthroughs emerge, we will continue to learn more about the elements that make up the mass of our solar system.
How Many Music Streams Does it Take to Earn a Dollar?
Streaming has breathed new life into the music business, but as new data shows, these services pay out wildly different rates per stream.
How Many Music Streams Does it Take to Earn a Dollar?
A decade ago, the music industry was headed for a protracted fade-out.
The disruptive effects of peer-to-peer file sharing had slashed music revenues in half, casting serious doubts over the future of the industry.
Ringtones provided a brief earnings bump, but it was the growing popularity of premium streaming services that proved to be the savior of record labels and artists. For the first time since the mid-90s, the music industry saw back-to-back years of growth, and revenues grew a brisk 12% in 2018 – nearly reaching $10 billion. In short, people showed they were still willing to pay for music.
Although most forecasts show streaming services like Spotify and Apple Music contributing an increasingly large share of revenue going forward, recent data from The Trichordist reveals that these services pay out wildly different rates per stream.
Note: Due to the lack of publicly available data, calculating payouts from streaming services is not an exact science. This data set is based on revenue from an indie label with a ~150 album catalogue generating over 115 million streams.
Full Stream Ahead
One would expect streaming services to have fairly similar payout rates every time a track is played, but this is not the case. In reality, the streaming rates of major players in the market – which have very similar catalogs – are all over the map. Below is a full breakdown of how many streams it takes to earn a dollar on various platforms:
|Streaming service||Avg. payout per stream||# of streams to earn one dollar||# of streams to earn minimum wage*|
|Google Play Music||$0.00676||147||217,751|
*U.S. monthly minimum wage of $1,472 **Premium tier
Napster, once public enemy number one in the music business, has some of the most generous streaming rates in the industry. On the downside, the brand currently has a market share of less than 1%, so getting a high volume of plays on an album isn’t likely to happen for most artists.
On the flip side of the equation, YouTube has the highest number of plays per song, but the lowest payout per stream by far. It takes almost 1,500 plays to earn a single dollar on the Google-owned video platform.
Spotify, which is now the biggest player in the streaming market, is on the mid-to-low end of the compensation spectrum.
The Payment Pipeline
How do companies like Spotify calculate the amount paid out to license holders? Here’s a look at their payout process:
As this chart reveals, dollars earned from streaming still don’t tell the full story of how much artists receive at the end of the line. This amount is influenced by whether or not the performer has a record deal, and if other contributors have a stake in the recorded work.
The Pressure is Heating Up
When Spotify was a scrappy startup providing a much needed revenue stream to the music industry, labels were temporarily willing to accept lower streaming rates.
But now that Spotify is a public company, and tech giants like Apple and Amazon are in the picture, a growing chorus of industry players will likely dial up the pressure to increase compensation rates.
The Global Fiber Optic Network Explained
An informative look at the global fiber optic network, how the cables actually work, and the technology that will power the 6G network.
The Global Fiber Optic Network Explained
As we scroll through Instagram or cue up another episode on Netflix, most of us give little thought to the hidden network of fiber optic cables that instantaneously shuttle information around the globe.
This extensive network of cables – which could stretch around the Equator 30 times – is the connective tissue that binds the internet, and thanks to our insatiable appetite for video streaming, it’s growing larger with every passing year.
Today’s video, by TED-Ed, explains how fiber optic cables work and introduces the next generation of cables that could drastically increase the speed of data transmission.
A Series of Tubes
The late Senator Ted Stevens drew laughter for describing the internet as a “series of tubes” in 2006, but as it turns out, most of the information moving around the world does, in fact, travel through a series of tubes. Undersea fiber optic tubes, to be exact.
The way this system functions is deceptively simple. Light, which is beamed into a fiber optic cable at a shallow angle, ricochets its way along the tube at close to light speed until being converted back into an electrical signal at its destination – generally a data center. To increase bandwidth further, some cables are able to carry multiple wavelengths concurrently.
Impressively, this simple method of bouncing light through a tube is what moves 99% of the world’s digital information.
The Glass Superhighway
Since the first undersea fiber optic cable, TAT-8, was constructed by a consortium of companies in 1988, the number of cables snaking across the ocean floor has risen dramatically. In fact, over 100 new cables will have been laid between 2016 and 2020, with a value of nearly $14 billion.
Increasing bandwidth requirements have transformed content providers from customers to cable owners. As a result, tech giants like Google and Facebook are taking a more active role in the expansion of the global fiber optic network. Google alone has at least five cable projects set for completion in 2019.
The Last Mile
Much like Amazon struggles with the “last mile” of deliveries, the transmission of digital information is much less efficient at the data center level, where servers are connected by traditional electric cables. These short-range cables are far less efficient than their fiber optic counterparts, losing half their running power as heat.
If this inefficient use of energy isn’t solved, internet-related activity could comprise a fifth of the world’s power consumption by 2030.
Thankfully, a related technology – integrated photonics – could keep the high-definition videos of the future streaming. Although the silicon wires used in integrated photonics do not guide light as effectively as fiber optics, the ultra-thin wires are far more compact. Photonic chips paired with burgeoning terahertz (THz) wireless communications could eventually form the backbone of a 6G network. Short-range THz signals would hitch a ride on silicon wires via tiny photonic chips scattered around population centers.
Before this efficient, high-capacity future is realized, researchers must first solve the puzzle of manufacturing photonic devices at scale. Once this method of data transmission hits the mainstream market, it could drastically alter the course of both computing and global energy consumption.
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