Visualizing the Gravitational Pull of the Planets
Gravity is one of the basic forces in the universe. Every object out there exerts a gravitational influence on every other object, but to what degree?
The gravity of the sun keeps all the planets in orbit in our solar system. However, each planet, moon and asteroid have their own gravitational pull defined by their density, size, mass, and proximity to other celestial bodies.
Dr. James O’Donoghue, a Planetary Astronomer at JAXA (Japan Aerospace Exploration Agency) created an animation that simplifies this concept by animating the time it takes a ball to drop from 1,000 meters to the surface of each planet and the Earth’s moon, assuming no air resistance, to better visualize the gravitational pull of the planets.
Sink like a Stone or Float like a Feather
Now, if you were hypothetically landing your spacecraft on a strange planet, you would want to know your rate of descent. Would you float like a feather or sink like a stone?
It is a planet’s size, mass, and density that determines how strong its gravitational pull is, or, how quick or slow you will approach the surface.
|Mass (1024kg)||Diameter (km)||Density (kg/m3)||Gravity (m/s2)||Escape Velocity (km/s)|
According to Dr. O’Donoghue, large planets have gravity comparable to smaller ones at the surface—for example, Uranus attracts the ball down slower than on Earth. This is because the relatively low average density of Uranus puts the actual surface of the planet far away from the majority of the planet’s mass in the core.
Similarly, Mars is almost double the mass of Mercury, but you can see the surface gravity is actually the same which demonstrates that Mercury is much denser than Mars.
Exploring the Outer Reaches: Gravity Assistance
Knowing the pull of each of the planets can help propel space flight to the furthest extents of the solar system. The “gravity assist” flyby technique can add or subtract momentum to increase or decrease the energy of a spacecraft’s orbit.
Generally it has been used in solar orbit, to increase a spacecraft’s velocity and propel it outward in the solar system, much farther away from the sun than its launch vehicle would have been capable of doing, as in the journey of NASA’s Voyager 2.
Launched in 1977, Voyager 2 flew by Jupiter for reconnaissance, and for a trajectory boost to Saturn. It then relied on a gravity assist from Saturn and then another from Uranus, propelling it to Neptune and beyond.
Despite the assistance, Voyager 2’s journey still took over 20 years to reach the edge of the solar system. The potential for using the power of gravity is so much more…
Tractor Beams, Shields, and Warp Drives…Oh My!
Imagine disabling an enemy starship with a gravity beam and deflecting an incoming photon torpedo with gravity shields. It would be incredible and a sci-fi dream come true.
However, technology is still 42 years from the fictional date in Star Trek when mankind built the first warp engine, harnessing the power of gravity and unlocking the universe for discovery. There is still time!
Currently, the ALPHA Experiment at CERN is investigating whether it is possible to create some form of anti-gravitational field. This research could create a gravitational conductor shield to counteract the forces of gravity and allow the creation of a warp drive.
By better understanding the forces that keep us grounded on our planets, the sooner we will be able to escape these forces and feel the gravitational pull of the planets for ourselves.
…to boldly go where no one has gone before!
10 Travel Destinations for Post-Pandemic Life
Excited to get back to travelling the world? This infographic highlights the 10 most popular tourist destinations.
10 Travel Destinations for Post-Pandemic Life
On March 11, 2020, the World Health Organization formally classified the COVID-19 outbreak as a pandemic. The resulting travel bans decimated the tourism industry, and international air travel initially fell by as much as 98%.
Almost two years later, travel is finally back on the table, though there are many restrictions to consider. Regardless, a survey conducted in September 2021 found that, as things revert to normalcy, 82% of Americans are looking forward to international travel more than anything else.
To give inspiration for your next vacation (whenever that may be), this infographic lists the 10 most visited countries in 2019, as well as three of their top attractions according to Google Maps.
Here were the 10 most popular travel destinations in 2019, measured by their number of international arrivals.
|Country||Number of international arrivals in 2019 (millions)|
|🇬🇧 United Kingdom||39.4|
*Estimate | Source: World Bank
France was the most popular travel destination by a significant margin, and it’s easy to see why. The country is home to many of the world’s most renowned sights, including the Arc de Triomphe and Louvre Museum.
The Arc de Triomphe was built in the early 1800s, and honors those who died in the French Revolutionary and Napoleonic Wars. In 1944, Allied soldiers marched through the monument after Paris was liberated from the Nazis.
The Louvre Museum, on the other hand, is often recognized by its giant glass pyramid. The museum houses over 480,000 works of art, including Leonardo da Vinci’s Mona Lisa.
Art isn’t the only thing that France has to offer. The country has a reputation for culinary excellence, and is home to 632 Michelin-starred restaurants, the most out of any country. Japan comes in at second, with 413.
While You’re There…
After seeing the sights in Paris, you may want to consider a visit to Spain. The country is the southern neighbor of France and is known for its beautiful villages and beaches.
One of its most impressive sights is the Sagrada Familia, a massive 440,000 square feet church which began construction in 1882, and is still being worked on today (139 years in the making). The video below shows the structure’s striking evolution.
At a height of 172 meters, the Sagrada Familia is approximately 52 stories tall.
Another popular spot is Ibiza, an island off the coast of Spain that is famous for its robust nightlife scene. The island is frequently mentioned in pop culture—Netflix released an adventure/romance movie titled Ibiza in 2018, and the remix of Mike Posner’s song I Took a Pill in Ibiza has over 1.4 billion views on YouTube.
If you’re looking for something outside of Europe, consider Mexico or Thailand, which are the 7th and 8th most popular travel destinations. Both offer hot weather and an abundance of white sand beaches.
If you need even more convincing, check out these links:
- The 13 Best Beaches in Mexico
- The Best Resorts in Mexico: 2021 Reader’s Choice
- The Best Night Markets in Bangkok, Thailand
- The Best Rooftop Bars in Bangkok
Under normal circumstances, hundreds of billions of dollars are spent each year by international tourists. According to the World Travel & Tourism Council (WTCC), this spending accounted for an impressive 10.4% of global GDP in 2019.
Travel restrictions introduced in 2020 dealt a serious blow to the industry, reducing its share of global GDP to 5.5%, and wiping out an estimated 62 million jobs. While the WTCC believes these jobs could return by 2022, the emerging Omicron variant has already prompted many countries to tighten restrictions once again.
To avoid headaches in the future, make sure you fully understand the rules and restrictions of where you’re heading.
Which Values Children Should Be Encouraged to Learn, By Country
Which qualities do people think are most important for children to learn? The answer differs from country to country.
Many of the values we prioritize as adults were instilled in us during our childhood days.
They’re called our formative years for a reason—from when we’re born up until we’re about eight years old, our brains are easily molded and remain highly sensitive to external influences and environments. But depending on where you grew up, you may have been exposed to different values during your childhood compared to someone from another place.
These visualizations by Anders Sundell illustrate the most important values people think children should learn at home, across more than 80 different countries.
Sundell used data from the World Values Survey, an international survey that interviews hundreds of thousands of participants from across the globe. Respondents were asked to pick up to five qualities they believe are the most desirable for children to have:
- Good manners
- Hard work
- Feeling of responsibility
- Tolerance and respect for other people
- Thrift, saving money
- Determination and perseverance
- Religious faith
Sundell took the survey data and calculated the proportion of people in each country that selected each quality. From there, he took the top qualities and created three separate plot graphs to show the contrast between them.
Let’s look at the importance that countries placed on different values, including (1) independence and obedience, (2) unselfishness and religious faith, and (3) hard work and imagination.
1. Independence vs Obedience
Nordic countries value independence greatly, and find obedience to be a less important quality to instill in children.
View the full-size infographic
Other available data also supports that adults in Nordic countries value independence. According to Eurostat, the most common age to leave home in Sweden is between 17 and 18—nearly a decade sooner than the average age across the EU (26 years old).
Denmark’s average age to leave home is also below the European average, at 21 years old.
On the other end of the spectrum, countries like Iraq and Egypt believe obedience is much more important for children to learn.
2. Unselfishness vs Religious Faith
Bangladesh, Egypt, and Jordan all place a strong emphasis on faith, and fall on the far right of this graph.
View the full-size infographic
Islam is a strong influence in all three of these countries. In Bangladesh and Jordan, it’s the official state religion. And while Egypt is a secular country, a majority of citizens identify as Muslim—about 90% of the population.
Interestingly, places like the U.S. and Hong Kong fall right in the between, placing relatively equal importance on religion and unselfishness.
3. Hard Work vs Imagination
Left-leaning Nordic countries like Sweden, Norway, Denmark, and Finland think imagination is more important for children to learn than hard work.
View the full-size infographic
Interestingly, Japan also scored high for imagination, seeing it was a more important value to teach children than hard work. This is despite the fact that the country has an international reputation for being a hardworking country, where even taking an extended vacation can be frowned upon. Then again, Japan has a reputation for producing wildly creative works of art that are popular internationally (anime, for instance).
As expected, countries and cultures contain multitudes, and can often seem paradoxical and complex to those who try to codify them.
What qualities do you think are most important, and what countries surprised you with their placements?
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