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As the Worlds Turn: Visualizing the Rotation of Planets

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As the Worlds Turn: Visualizing the Rotations of Planets

The rotation of planets have a dramatic effect on their potential habitability.

Dr. James O’Donoghue, a planetary scientist at the Japanese space agency who has the creative ability to visually communicate space concepts like the speed of light and the vastness of the solar system, recently animated a video showing cross sections of different planets spinning at their own pace on one giant globe.

Cosmic Moves: The Rotation of the Planets

Each planet in the solar system moves to its own rhythm. The giant gas planets (Jupiter, Saturn, Uranus, and Neptune) spin more rapidly on their axes than the inner planets. The sun itself rotates slowly, only once a month.

PlanetRotation Periods (relative to stars)
Mercury58d 16h
Venus243d 26m
Earth23h 56m
Mars24h 36m
Jupiter9h 55m
Saturn10h 33m
Uranus17h 14m
Neptune16h

The planets all revolve around the sun in the same direction and in virtually the same plane. In addition, they all rotate in the same general direction, with the exceptions of Venus and Uranus.

In the following animation, their respective rotation speeds are compared directly:

The most visually striking result of planetary spin is on Jupiter, which has the fastest rotation in the solar system. Massive storms of frozen ammonia grains whip across the surface of the gas giant at speeds of 340 miles (550 km) per hour.

Interestingly, the patterns of each planet’s rotation can help in revealing whether they can support life or not.

Rotation and Habitability

As a fish in water is not aware it is wet, so it goes for humans and the atmosphere around us.

New research reveals that the rate at which a planet spins is an essential component for supporting life. Not only does rotation control the length of day and night, bit it influences atmospheric wind patterns and the formation of clouds.

The radiation the Earth receives from the Sun concentrates at the equator. The Sun heats the air in this region until it rises up through the atmosphere and moves towards the poles of the planet where it cools. This cool air falls through the atmosphere and flows back towards the equator.

This process is known as a Hadley cell, and atmospheres can have multiple cells:

Hadley Cells

A planet with a quick rotation forms Hadley cells at low latitudes into different bands that encircle the planet. Clouds become prominent at tropical regions, which reflect a proportion of the light back into space.

For a planet in a tighter orbit around its star, the radiation received from the star is much more extreme. This decreases the temperature difference between the equator and the poles, ultimately weakening Hadley cells. The result is fewer clouds in tropical regions available to protect the planet from intense heat, making the planet uninhabitable.

Slow Rotators: More Habitable

If a planet rotates slower, then the Hadley cells can expand to encircle the entire world. This is because the difference in temperature between the day and night side of the planet creates larger atmospheric circulation.

Slow rotation makes days and nights longer, such that half of the planet bathes in light from the sun for an extended period of time. Simultaneously, the night side of the planet is able to cool down.

This difference in temperature is large enough to cause the warm air from the day side to flow to the night side. This movement of air allows more clouds to form around a planet’s equator, protecting the surface from harmful space radiation, encouraging the possibility for the right conditions for life to form.

The Hunt for Habitable Planets

Measuring the rotation of planets is difficult with a telescope, so another good proxy would be to measure the level of heat emitted from a planet.

An infrared telescope can measure the heat emitted from a planet’s clouds that formed over its equator. An unusually low temperature at the hottest location on the planet could indicate that the planet is potentially a habitable slow rotator.

Of course, even if a planet’s rotation speed is just right, many other conditions come into play. The rotation of planets is just another piece in the puzzle in identifying the next Earth.

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Markets

World Beer Index 2021: What’s the Price of a Beer in Your Country?

The global desire for beer prevails even in a pandemic. These maps compare the average beer price in 58 countries—just how much do we drink?

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What’s the Price of A Beer in Your Country?

View the high resolution of this infographic by clicking here.

Although fewer people have been able to grab a beer at the pub during this pandemic, the global desire for beer prevails. For example, sales of the Corona beer actually shot up in the past year, despite—or perhaps because of—associations with the coronavirus.

This World Beer Index from Expensivity compares the average price of a bottle of beer in 58 countries in a detailed map. Additionally, we show which countries spend the most on beer per capita, and just how much beer people really drink.

Pricey Pints: The Average Price of a Beer

Researchers calculated the average price of a typical bottle of beer (330ml, just shy of a pint) from well known brands via online stores and statistics database Numbeo. In addition, local beer prices were pulled from hotel and bar menus, and average values converted to USD.

In Qatar, you’d have to shell out $11.26 for a single beer, which would surely make for a really expensive night out on the town. In part, this is because in 2019, the Muslim-majority country introduced a 100% excise tax on top the previous sales price of all alcohol imports.

These steep prices are aimed at tourists—and with Qatar hosting the 2022 men’s soccer World Cup, there’ll be thousands of visitors in the country looking for a cold one at any price.

RankCountryCapital CityAverage Price of a Beer
1South AfricaPretoria, Bloemfontein, Cape Town$1.68
2UkraineKyiv$1.76
3ArgentinaBuenos Aires$1.79
4Bosnia And HerzegovinaSarajevo$1.96
5GhanaAccra$2.05
6TunisiaTunis$2.09
7GeorgiaTbilisi$2.30
8North MacedoniaSkopje$2.34
9ChileSantiago$2.40
10Czech Republic (Czechia)Prague$2.49
11RwandaKigali$2.52
12BrazilBrasilia$2.52
13HaitiPort Au Prince$2.66
14ColombiaBogota$2.72
15SpainMadrid$2.74
16PanamaPanama City$2.74
17Sri LankaColombo$2.77
18HungaryBudapest$2.84
19ArmeniaYerevan$2.96
20IndonesiaJakarta$3.17
21AzerbaijanBaku$3.18
22GuyanaGeorgetown$3.39
23BoliviaSanta Cruz$3.42
24KazakhstanNur-Sultan$3.44
25BelgiumBrussels$3.47
26TurkeyIstanbul$3.61
27MaltaValletta$3.65
28BelarusMinsk$3.72
29EgyptCairo$3.80
30IndiaNew Delhi$3.90
31CanadaOttawa$3.96
32AustriaVienna$3.99
33WalesCardiff$4.06
34NepalKathmandu$4.13
35ScotlandEdinburgh$4.18
36GreeceAthens$4.25
37PhilippinesManila$4.25
38PolandWarsaw$4.37
39MexicoMexcio City$4.46
40LithuaniaVilnius$4.55
41South KoreaSeoul$4.56
42NetherlandsAmsterdam$4.60
43GermanyBerlin$4.64
44MalaysiaKuala Lumpur$4.74
45United StatesWashington D.C.$4.75
46ThailandBangkok$4.82
47PortugalLisbon$5.06
48RussiaMoscow$5.08
49SingaporeSingapore$5.17
50DenmarkCopenhagen$5.20
51ItalyRome$5.83
52EnglandLondon$5.97
53JapanTokyo$6.16
54SwitzerlandBern$6.23
55FranceParis$6.39
56ChinaBeijing$7.71
57JordanAmman$9.40
58QatarDoha$11.26

At just $1.68 per bottle, South Africa has the lowest average price of a beer thanks at least partially to cultural norms of buying in bulk.

Cashing In: The Per Capita Spend on Beer

The price of a single beer is one thing, but which countries spend the most on beer itself? Germany unsurprisingly tops the list here with nearly $2,000 of expenditures per capita, bolstered by its strong beer culture and annual Oktoberfest celebration.

Germany also prides itself on the purity of its beer—the vast majority of brewers follow the Reinheitsgebot, centuries-old purity laws that broadly state that beer may contain only three ingredients: water, barley, and hops.

World Beer Index 2021 - Per Capita Spend on Beer 820px
View the high resolution of this infographic by clicking here.

Following closely behind is Poland, which spends $1,738 per capita. Meanwhile, the U.S. ranks eighth in the world for the highest spending on beer per capita at $1,554—beer is also the country’s most popular alcoholic beverage.

Getting Boozy: How Much Beer Do People Drink?

Using data from the World Health Organization, the visualization below also digs into how much beer is consumed around the world per capita.

The Czech Republic emerges on top in this regard, with 468 beers on average in a year—that works out to 1.3 beers per day. Spain and Germany are next with 417 and 411 beers, respectively.

World Beer Index 2021 - Per Capita Beer Consumption 820px
View the high resolution of this infographic by clicking here.

On the flip side, people in Haiti only drink about four beers yearly. This may be because they prefer something a little stronger—97% of alcohol consumption in the nation comes from spirits such as rum.

Beer has been around for over 7,000 years. No matter the price of a beer in your country, it’s worth raising a glass to the timelessness of this humble beverage.

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Economy

How Global Health and Wealth Has Changed Over Two Centuries

This unique animated visualization uses health and wealth measurements to chart the evolution of countries over time.

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two centuries of health and wealth

How Global Health and Wealth Has Changed Over 221 Years

At the dawn of the 19th century, global life expectancy was only 28.5 years.

Outbreaks, war, and famine would still kill millions of people at regular intervals. These issues are still stubbornly present in 21st century society, but broadly speaking, the situation around the world has vastly improved. Today, most of humanity lives in countries where the life expectancy is above the typical retirement age of 65.

At the same time, while inequality remains a hot button topic within countries, income disparity between countries is slowing beginning to narrow.

This animated visualization, created by James Eagle, tracks the evolution of health and wealth factors in countries around the world. For further exploration, Gapminder also has a fantastic interactive chart that showcases the same dataset.

The Journey to the Upper-Right Quadrant

In general terms, history has seen health practices improve and countries become increasingly wealthy–trends that are reflected in this visualization. In fact, most countries drift towards the upper-right quadrant over the 221 years covered in the dataset.

However, that path to the top-right, which indicates high levels of both life expectancy and GDP per capita, is rarely a linear journey. Here are some of the noteworthy events and milestones to watch out for while viewing the animation.

1880s: Breaking the 50-Year Barrier
In the late 19th century, Nordic countries such as Sweden and Norway already found themselves past the 50-year life expectancy mark. This was a significant milestone considering the global life expectancy was a full 20 years shorter at the time. It wasn’t until the year 1960 that the global life expectancy would catch up.

1918: The Spanish Flu and WWI
At times, a confluence of factors can impact health and wealth in countries and regions. In this case, World War I coincided with one of the deadliest pandemics in history, leading to global implications. In the animation, this is abundantly clear as the entire cluster of circles takes a nose dive for a short period of time.

1933, 1960: Communist Famines
At various points in history, human decisions can have catastrophic consequences. This was the case in the Soviet Union (1933) and the People’s Republic of China (1960), where life expectancy plummeted during famines that killed millions of people. These extreme events are easy to spot in the animation due to the large populations of the countries in question.

1960s: Oil Economies Kick into High Gear
During this time, Iran, Iraq, and Saudi Arabia all experience massive booms in wealth, and in the following decade, smaller countries such as the United Arab Emirates and Kuwait rocket to the right edge of the visualization.

In following decades, both Iran and Iraq can be seen experiencing wild fluctuations in both health and wealth as regime changes and conflict begin to destabilize the region.

1990s: AIDS in Africa
In the animation, a number of countries plummet in unison at the end of the 20th century. These are sub-Saharan African countries that were hit hard by the AIDS pandemic. At its peak in the early ’00s, the disease accounted for more than half of deaths in some countries.

1995: Breaking the 65-Year Barrier
Global life expectancy reaches retirement age. At this point in time, there is a clear divide in both health and wealth between African and South Asian countries and the rest of the world. Thankfully, that gap is would continue to narrow in coming years.

1990-2000s: China’s Economic Rise
With a population well over a billion people, it’s impossible to ignore China in any global overview. Starting from the early ’90s, China begins its march from the left to right side of the chart, highlighting the unprecedented economic growth it experienced during that time.

What the Future Holds

If current trends continue, global life expectancy is expected to surpass the 80-year mark by 2100. And, sub-Saharan Africa, which has the lowest life expectancy today, is expected to mostly close the gap, reaching 75 years of age.

Wealth is also expected to increase nearly across the board, with the biggest gains coming from places like Vietnam, Nigeria, and the Philippines. Some experts are projecting the world economy as a whole to double in size by 2050.

There are always bumps along the way, but it appears that the journey to the upper-right quadrant is still very much underway.

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