Visualizing the Speed of Light (Fast, but Slow)
Visualizing the Speed of Light
With the flip of a switch, your room can be instantenously flooded with brightness.
In fact, there is no noticeable lag effect at all.
That’s because emitted photons travel at 186,000 miles (300,000 km) per second, meaning it takes only 1/500,000th of a second for light to reach even the furthest part of an ordinary room. And, if it could go through the wall, it would orbit the entire planet 7.5 times in just one second.
Light Speed is Fast…
In our every day experiences, we never see light as having to “take time” to do anything. It’s inconceivably fast, brightening up everything in its path in an instant — and with a few odd caveats, scientists believe light speed to be the fastest-known achievable pace in the universe.
But what if we get out of our bubble, and look at light from outside the confines of life on Earth?
Today’s animation, which comes from planetary scientist Dr. James O’Donoghue, helps visualize the speed of light in a broader context. It helps remind us of the mechanics of this incredible phenomenon, while also highlighting the vast distances between celestial bodies — even in our small and insignificant corner of the solar system.
Light Speed is Slow…
Once a photon is sent into the vast abyss, suddenly the fastest possible speed seems somewhat pedestrian.
- Moon: It takes about 1.255 seconds for light to get from Earth to the moon.
- Mars: Mars is about 150x further than the moon — about 40 million miles (54.6 million km) in the closest approach — so it takes 3 minutes to get there from Earth.
- Sun: The sun is 93 million miles (150 million km) away, meaning it takes 8 minutes to see its light.
Let that sink in for a moment: the sun could explode right now, and we wouldn’t even know about it for eight long minutes.
Going Further, Taking Longer
If it takes light a few minutes to get to the closest planets, how long does it take for light to travel further away from Earth?
- Jupiter: The largest planet is 629 million km away when it’s closest, taking light about 35 minutes.
- Saturn: The ringed planet is about as twice as far as Jupiter, taking light 71 minutes.
- Pluto: It takes about 5.5 hours for light to go from Earth to the dwarf planet.
- Alpha Centauri: The nearest star system is 4.3 light years away, or 25 trillion miles (40 trillion km).
- Visible stars: The average distance to the 300 brightest stars in the sky is about 347 light years.
If you really want to get the feeling of how “slow” light really is, watch the below video and journey from the sun to Jupiter. It’s done in real-time, so it takes about 43 minutes:
So while light obviously travels at a ludicrous speed, it really depends on your vantage point.
On Earth, light is instantaneous – but anywhere else in the universe, it’s pretty inadequate for getting anywhere far (especially in contrast to the average human lifespan).
Charted: The Number of Democracies Globally
How many democracies does the world have? This visual shows the change since 1945 and the top nations becoming more (and less) democratic.
Charted: The Number of Democracies Globally
The end of World War II in 1945 was a turning point for democracies around the world.
Before this critical turning point in geopolitics, democracies made up only a small number of the world’s countries, both legally and in practice. However, over the course of the next six decades, the number of democratic nations would more than quadruple.
Interestingly, studies have found that this trend has recently reversed as of the 2010s, with democracies and non-democracies now in a deadlock.
In this visualization, Staffan Landin uses data from V-DEM’s Electoral Democratic Index (EDI) to highlight the changing face of global politics over the past two decades and the nations that contributed the most to this change.
V-DEM’s EDI attempts to measure democratic development in a comprehensive way, through the contributions of 3,700 experts from countries around the world.
Instead of relying on each nation’s legally recognized system of government, the EDI analyzes the level of electoral democracy in countries on a range of indicators, including:
- Free and fair elections
- Rule of law
- Alternative sources of information and association
- Freedom of expression
Countries are assigned a score on a scale from 0 to 1, with higher scores indicating a higher level of democracy. Each is also categorized into four types of functional government, from liberal and electoral democracies to electoral and closed autocracies.
Which Countries Have Declined the Most?
The EDI found that numerous countries around the world saw declines in democracy over the past two decades. Here are the 10 countries that saw the steepest decline in EDI score since 2010:
|Country||Democracy Index (2010)||Democracy Index (2022)||Points Lost|
Central and Eastern Europe was home to three of the countries seeing the largest declines in democracy. Hungary, Poland, and Serbia lead the table, with Hungary and Serbia in particular dropping below scores of 0.5.
Some of the world’s largest countries by population also decreased significantly, including India and Brazil. Across most of the top 10, the “freedom of expression” indicator was hit particularly hard, with notable increases in media censorship to be found in Afghanistan and Brazil.
Countries Becoming More Democratic
Here are the 10 countries that saw the largest increase in EDI score since 2010:
|Country||Democracy Index (2010)||Democracy Index (2022)||Points Gained|
|🇬🇲 The Gambia||0.25||0.50||+25|
|🇱🇰 Sri Lanka||0.42||0.57||+15|
Armenia, Fiji, and Seychelles saw significant improvement in the autonomy of their electoral management bodies in the last 10 years. Partially as a result, both Armenia and Seychelles have seen their scores rise above 0.5.
The Gambia also saw great improvement across many election indicators, including the quality of voter registries, vote buying, and election violence. It was one of five African countries to make the top 10 most improved democracies.
With the total number of democracies and non-democracies almost tied over the past four years, it is hard to predict the political atmosphere in the future.
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