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Visualizing the Gravitational Pull of the Planets

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    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)
    Mercury0.334,8795,4273.74.3
    Venus4.8712,1045,2438.910.4
    Earth5.9712,7565,5149.811.2
    Moon0.0733,4753,3401.62.4
    Mars0.6426,7923,9333.75.0
    Jupiter1,898142,9841,32623.159.5
    Saturn568120,5366879.035.5
    Uranus86.851,1181,2718.721.3
    Neptune10249,5281,63811.023.5
    Pluto0.01462,3702,0950.71.3

    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.


    Gravity Assist

    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!

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War

Interactive: Comparing Military Spend Around the World

Which countries have the highest military spend relative to their economy? This visual breaks down the amount spent in each country by GDP.

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A map showing countries' military spend as a percentage of their gross domestic product.

Comparing Military Spend Around the World

One of the easiest ways to identify a nation’s priorities is by tracking its expenditures, and military spend is no different.

Usually spending is measured, and ranked, in absolute amounts. For example, countries around the world collectively spent $2.1 trillion on their militaries in 2021, with the most coming from the U.S. ($800 billion), China ($293 billion), and India ($77 billion).

But these eye-popping figures are best understood in the context of each country’s economy. Using data from the Stockholm International Peace Research Institute (SIPRI), Varun Jain has visualized 158 countries’ military expenditures, both as a percentage of their total GDP as well as in average per-capita spend.

Countries’ Military Spend as a Percentage of their Economy

To begin, Jain identified three categories of military expenditure as a percent of GDP, using the five-year (2018‒2022) average for more consistent data:

Military Spend% of GDPCountries
HighAbove 5%7
Medium2‒5%44
LowBelow 2%107

Under this categorization, the stand outs are the countries spending an outsized amount of their economic output on military, rather than the highest total spenders in absolute terms.

At the top of the table is Ukraine, which has earmarked a staggering average of 9.46% of its total economic output on defense over the past five years. That’s well ahead of second-place Saudi Arabia, which is slightly above 8%.

In Ukraine’s case, its high ranking shows how quickly priorities can change. From 2018 to 2021, the country spent 3.2-3.8% of its GDP on its military, but the outbreak of war with Russia saw its expenditures jump to one-third of economic output.

Other countries from the Middle East and North Africa follow in this tier, with Oman third at 8.11% and Qatar fourth with 5.88%. Rounding out the top seven high spenders are Algeria, Kuwait, and Israel.

RankCountryMilitary Spend% of GDP
1🇺🇦 UkraineHigh9.46%
2🇸🇦 Saudi ArabiaHigh8.19%
3🇴🇲 OmanHigh8.11%
4🇶🇦 QatarHigh5.88%
5🇩🇿 AlgeriaHigh5.70%
6🇰🇼 KuwaitHigh5.66%
7🇮🇱 IsraelHigh5.09%
8🇯🇴 JordanMedium4.81%
9🇦🇲 ArmeniaMedium4.53%
10🇦🇿 AzerbaijanMedium4.53%
11🇱🇧 LebanonMedium4.01%
12🇷🇺 RussiaMedium3.98%
13🇧🇭 BahrainMedium3.79%
14🇵🇰 PakistanMedium3.75%
15🇲🇦 MoroccoMedium3.72%
16🇺🇿 UzbekistanMedium3.56%
17🇺🇸 U.S.Medium3.48%
18🇨🇴 ColombiaMedium3.24%
19🇬🇷 GreeceMedium3.15%
20🇳🇦 NamibiaMedium3.09%
21🇧🇳 BruneiMedium3.09%
22🇸🇸 South SudanMedium3.05%
23🇹🇬 TogoMedium3.03%
24🇲🇱 MaliMedium2.90%
25🇨🇺 CubaMedium2.88%
26🇸🇬 SingaporeMedium2.86%
27🇧🇼 BotswanaMedium2.86%
28🇲🇲 MyanmarMedium2.76%
29🇧🇫 Burkina FasoMedium2.70%
30🇮🇶 IraqMedium2.69%
31🇰🇷 South KoreaMedium2.69%
32🇨🇬 Republic of CongoMedium2.68%
33🇹🇩 ChadMedium2.66%
34🇮🇳 IndiaMedium2.58%
35🇹🇳 TunisiaMedium2.58%
36🇪🇨 EcuadorMedium2.34%
37🇮🇷 IranMedium2.32%
38🇻🇳 Viet NamMedium2.28%
39🇰🇭 CambodiaMedium2.26%
40🇲🇷 MauritaniaMedium2.24%
41🇳🇪 NigerMedium2.21%
42🇧🇮 BurundiMedium2.21%
43🇹🇷 TurkeyMedium2.19%
44🇵🇱 PolandMedium2.17%
45🇱🇻 LatviaMedium2.14%
46🇱🇹 LithuaniaMedium2.13%
47🇪🇪 EstoniaMedium2.13%
48🇬🇧 United KingdomMedium2.12%
49🇺🇾 UruguayMedium2.11%
50🇷🇸 SerbiaMedium2.06%
51🇺🇬 UgandaMedium2.02%
52🇭🇷 CroatiaLow1.97%
53🇦🇺 AustraliaLow1.93%
54🇨🇱 ChileLow1.92%
55🇫🇷 FranceLow1.91%
56🇨🇾 CyprusLow1.90%
57🇷🇴 RomaniaLow1.87%
58🇧🇬 BulgariaLow1.85%
59🇸🇿 EswatiniLow1.82%
60🇳🇴 NorwayLow1.81%
61🇨🇫 Central African RepublicLow1.78%
62🇱🇰 Sri LankaLow1.77%
63🇵🇹 PortugalLow1.77%
64🇹🇼 TaiwanLow1.76%
65🇨🇳 ChinaLow1.72%
66🇬🇪 GeorgiaLow1.71%
67🇸🇰 SlovakiaLow1.67%
68🇬🇼 Guinea-BissauLow1.65%
69🇰🇬 KyrgyzstanLow1.62%
70🇬🇳 GuineaLow1.61%
71🇫🇮 FinlandLow1.60%
72🇸🇳 SenegalLow1.58%
73🇭🇳 HondurasLow1.56%
74🇬🇦 GabonLow1.56%
75🇲🇿 MozambiqueLow1.56%
76🇱🇸 LesothoLow1.56%
77🇲🇪 MontenegroLow1.54%
78🇫🇯 FijiLow1.54%
79🇯🇲 JamaicaLow1.49%
80🇦🇴 AngolaLow1.48%
81🇮🇹 ItalyLow1.48%
82🇭🇺 HungaryLow1.48%
83🇧🇴 BoliviaLow1.46%
84🇸🇨 SeychellesLow1.43%
85🇳🇱 NetherlandsLow1.41%
86🇸🇩 SudanLow1.39%
87🇷🇼 RwandaLow1.39%
88🇳🇵 NepalLow1.36%
89🇩🇰 DenmarkLow1.36%
90🇦🇱 AlbaniaLow1.34%
91🇪🇸 SpainLow1.34%
92🇹🇭 ThailandLow1.33%
93🇦🇫 AfghanistanLow1.33%
94🇳🇿 New ZealandLow1.32%
95🇨🇦 CanadaLow1.32%
96🇩🇪 GermanyLow1.31%
97🇲🇰 North MacedoniaLow1.30%
98🇧🇷 BrazilLow1.29%
99🇧🇿 BelizeLow1.28%
100🇸🇻 El SalvadorLow1.28%
101🇧🇩 BangladeshLow1.26%
102🇿🇲 ZambiaLow1.25%
103🇬🇶 Equatorial GuineaLow1.24%
104🇬🇾 GuyanaLow1.22%
105🇨🇮 Cote d'IvoireLow1.22%
106🇪🇬 EgyptLow1.20%
107🇵🇪 PeruLow1.20%
108🇧🇾 BelarusLow1.18%
109🇸🇪 SwedenLow1.17%
110🇰🇪 KenyaLow1.13%
111🇸🇮 SloveniaLow1.10%
112🇹🇱 Timor LesteLow1.08%
113🇹🇿 TanzaniaLow1.05%
114🇨🇲 CameroonLow1.04%
115🇹🇯 TajikistanLow1.03%
116🇯🇵 JapanLow1.03%
117🇧🇪 BelgiumLow1.02%
118🇱🇷 LiberiaLow1.00%
119🇲🇾 MalaysiaLow0.98%
120🇵🇭 PhilippinesLow0.96%
121🇵🇾 ParaguayLow0.95%
122🇽🇰 KosovoLow0.95%
123🇿🇦 South AfricaLow0.94%
124🇲🇼 MalawiLow0.92%
125🇧🇦 Bosnia and HerzegovinaLow0.84%
126🇰🇿 KazakhstanLow0.83%
127🇦🇹 AustriaLow0.78%
128🇬🇲 GambiaLow0.76%
129🇹🇹 Trinidad & TobagoLow0.75%
130🇮🇩 IndonesiaLow0.74%
131🇨🇭 SwitzerlandLow0.73%
132🇨🇿 Czech RepublicLow0.71%
133🇩🇴 Dominican RepublicLow0.70%
134🇲🇳 MongoliaLow0.69%
135🇲🇬 MadagascarLow0.68%
136🇨🇩 Dem. Rep. of CongoLow0.64%
137🇳🇬 NigeriaLow0.64%
138🇪🇹 EthiopiaLow0.64%
139🇸🇱 Sierra LeoneLow0.64%
140🇦🇷 ArgentinaLow0.63%
141🇱🇺 LuxembourgLow0.61%
142🇲🇽 MexicoLow0.61%
143🇳🇮 NicaraguaLow0.60%
144🇨🇻 Cape VerdeLow0.54%
145🇧🇯 BeninLow0.54%
146🇲🇹 MaltaLow0.48%
147🇬🇹 GuatemalaLow0.45%
148🇬🇭 GhanaLow0.43%
149🇵🇬 Papua New GuineaLow0.38%
150🇲🇩 MoldovaLow0.36%
151🇮🇪 IrelandLow0.27%
152🇿🇼 ZimbabweLow0.26%
153🇻🇪 VenezuelaLow0.20%
154🇭🇹 HaitiLow0.17%
155🇲🇺 MauritiusLow0.16%
156🇨🇷 Costa RicaLow0.00%
157🇮🇸 IcelandLow0.00%
158🇵🇦 PanamaLow0.00%

The medium group consists of 44 countries and is led by four nations (Jordan, Armenia, Azerbaijan, and Lebanon) that all spend more than 4% of their GDP on their militaries. Other familiar countries known to have large military budgets, like Russia, Pakistan, the U.S., India and the UK, are also in this category.

The low spend group has a total of 107 countries, but also contains some surprises. For example, China, France, and Germany—all in the top 10 countries by absolute military spend—actually have similar amounts of military spend as a percent of GDP as Georgia, Cyprus, and North Macedonia respectively.

At the bottom of the table are countries with either low military importance, or strange technicalities. For example, Mauritius is one of the countries with the lowest military budgets because it doesn’t officially have a standing military, instead relying on two paramilitary forces (a special mobile force and a Coast Guard).

Similarly, Iceland allocates 0% of its GDP towards military spending. In place of a standing army, the country maintains a specialized peacekeeping force, a substantial Coast Guard, and relies on security alliances within NATO, of which it is a member and provides financial support to.

Ranking Defense Spending Per Capita

While the measure above equalizes military spend on economic strength, per-capita military spending shows how much countries allocate while accounting for population size.

On a per-capita basis (again using a five-year average), Qatar leads the ranks with a per-capita spend of $4,564, well-ahead of Israel at $2,535, and Saudi Arabia at $1,928.

RankCountryPer Capita Spend ($)
1🇶🇦 Qatar$4,564
2🇮🇱 Israel$2,535
3🇸🇦 Saudi Arabia$1,928
4🇸🇬 Singapore$1,837
5🇰🇼 Kuwait$1,815
6🇺🇸 U.S.$1,815
7🇳🇴 Norway$1,438
8🇴🇲 Oman$1,254
9🇦🇺 Australia$1,131
10🇧🇳 Brunei$959
11🇬🇧 UK$913
12🇰🇷 South Korea$894
13🇧🇭 Bahrain$863
14🇩🇰 Denmark$861
15🇫🇷 France$811
16🇫🇮 Finland$801
17🇳🇱 Netherlands$765
18🇱🇺 Luxembourg$694
19🇸🇪 Sweden$662
20🇨🇭 Switzerland$647
21🇨🇦 Canada$645
22🇬🇷 Greece$629
23🇩🇪 Germany$623
24🇳🇿 New Zealand$610
25🇪🇪 Estonia$535
26🇹🇼 Taiwan$495
27🇮🇹 Italy$494
28🇧🇪 Belgium$487
29🇷🇺 Russia$467
30🇱🇹 Lithuania$463
31🇵🇹 Portugal$417
32🇱🇻 Latvia$405
33🇨🇾 Cyprus$399
34🇯🇵 Japan$398
35🇪🇸 Spain$395
36🇦🇹 Austria$393
37🇵🇱 Poland$359
38🇺🇾 Uruguay$354
39🇸🇰 Slovakia$334
40🇱🇧 Lebanon$334
41🇸🇮 Slovenia$302
42🇺🇦 Ukraine$302
43🇭🇷 Croatia$294
44🇨🇱 Chile$292
45🇷🇴 Romania$258
46🇭🇺 Hungary$248
47🇮🇪 Ireland$235
48🇸🇨 Seychelles$230
49🇦🇿 Azerbaijan$226
50🇩🇿 Algeria$219
51🇦🇲 Armenia$217
52🇧🇼 Botswana$215
53🇯🇴 Jordan$207
54🇹🇷 Turkey$199
55🇨🇴 Colombia$197
56🇧🇬 Bulgaria$194
57🇨🇳 China$183
58🇲🇹 Malta$175
59🇨🇿 Czech Republic$175
60🇮🇷 Iran$169
61🇳🇦 Namibia$159
62🇮🇶 Iraq$145
63🇪🇨 Ecuador$138
64🇲🇪 Montenegro$137
65🇷🇸 Serbia$133
66🇹🇹 Trinidad & Tobago$131
67🇬🇦 Gabon$124
68🇲🇦 Morocco$122
69🇬🇶 Equatorial Guinea$112
70🇲🇾 Malaysia$109
71🇧🇷 Brazil$107
72🇹🇭 Thailand$97
73🇬🇾 Guyana$92
74🇹🇳 Tunisia$91
75🇫🇯 Fiji$83
76🇲🇰 North Macedonia$83
77🇰🇿 Kazakhstan$82
78🇵🇪 Peru$81
79🇬🇪 Georgia$80
80🇧🇾 Belarus$80
81🇯🇲 Jamaica$77
82🇦🇱 Albania$76
83🇸🇿 Eswatini$72
84🇱🇰 Sri Lanka$69
85🇦🇷 Argentina$66
86🇧🇿 Belize$60
87🇲🇽 Mexico$59
88🇩🇴 Dominican Republic$58
89🇻🇳 Viet Nam$58
90🇿🇦 South Africa$56
91🇸🇻 El Salvador$54
92🇧🇦 Bosnia and Herzegovina$54
93🇮🇳 India$53
94🇨🇬 Republic of Congo$53
95🇵🇾 Paraguay$52
96🇧🇴 Bolivia$51
97🇵🇰 Pakistan$49
98🇺🇿 Uzbekistan$44
99🇦🇴 Angola$43
100🇽🇰 Kosovo$42
101🇲🇷 Mauritania$42
102🇭🇳 Honduras$42
103🇪🇬 Egypt$41
104🇰🇭 Cambodia$36
105🇲🇲 Myanmar$35
106🇵🇭 Philippines$33
107🇲🇳 Mongolia$33
108🇮🇩 Indonesia$31
109🇧🇩 Bangladesh$27
110🇹🇱 Timor Leste$27
111🇲🇱 Mali$26
112🇸🇳 Senegal$24
113🇨🇮 Cote d'Ivoire$23
114🇹🇬 Togo$21
115🇰🇪 Kenya$21
116🇰🇬 Kyrgyzstan$20
117🇧🇫 Burkina Faso$20
118🇬🇳 Guinea$19
119🇱🇸 Lesotho$19
120🇨🇻 Cape Verde$19
121🇬🇹 Guatemala$19
122🇹🇩 Chad$18
123🇸🇸 South Sudan$18
124🇸🇩 Sudan$18
125🇺🇬 Uganda$18
126🇿🇼 Zimbabwe$17
127🇿🇲 Zambia$16
128🇲🇺 Mauritius$16
129🇨🇲 Cameroon$16
130🇳🇵 Nepal$15
131🇳🇬 Nigeria$14
132🇳🇮 Nicaragua$12
133🇬🇼 Guinea-Bissau$12
134🇹🇿 Tanzania$12
135🇨🇺 Cuba$11
136🇷🇼 Rwanda$11
137🇲🇩 Moldova$11
138🇵🇬 Papua New Guinea$10
139🇳🇪 Niger$10
140🇹🇯 Tajikistan$9
141🇨🇫 Central African Republic$8
142🇲🇿 Mozambique$8
143🇬🇭 Ghana$8
144🇧🇯 Benin$7
145🇧🇮 Burundi$7
146🇦🇫 Afghanistan$6
147🇬🇲 Gambia$6
148🇪🇹 Ethiopia$5
149🇻🇪 Venezuela$5
150🇲🇼 Malawi$4
151🇸🇱 Sierra Leone$3
152🇲🇬 Madagascar$3
153🇨🇩 Dem. Rep. of Congo$3
154🇱🇷 Liberia$3
155🇭🇹 Haiti$2
156🇨🇷 Costa Rica$0
157🇮🇸 Iceland$0
158🇵🇦 Panama$0

Measured this way, we get a perspective of how small defense budgets can be per person, even if the total expenditure is large.

For example, India has the fourth-highest total defense expenditure in 2022, but because of its massive population only sets aside $53 per resident for its military, putting it solidly at the bottom third of the per-capita rankings.

Patterns Revealed By Measuring Military Spend

Changing how we look at a country’s military budget can reveal a lot more than just looking at absolute numbers.

For example, the Middle East is the region with the highest spenders on defense as a percentage of their GDP, giving us insight into regional security concerns.

Countries from the medium group of military spending—including parts of Eastern Europe, sub-Saharan Africa, and South Asia—highlight past or recent conflict zones between neighbors, countries with internal strife, or countries wary of a regional aggressor. Ukraine’s average per capita military spend, for example, was just $122.4 from 2018 to 2021. The next year, it jumped nearly 10 times to $1,018.66 per person after Russia’s invasion.

In fact, European military spending saw its sharpest one-year jump in 30 years as a direct result of the war.

Alongside European anxieties, ongoing tension between China and Taiwan has also contributed to increased military spending in Asia and Oceania. Will these budgets continue their dramatic ascent or will they rise evenly alongside their relative economies in 2023?

Data note: For these comparisons, the creator is calculating five-year averages (using data from 2018-2022) for military spending as a percentage of GDP and per-capita military spending for each country. The military expenditure data is pulled from Stockholm International Peace Research Institute.

Data for some countries is missing or may vary significantly from official figures. Countries with up to
two years of missing data had averages calculated on the years available, while countries with three or more years of missing data have been removed from this dataset, including: Djibouti, Eritrea, North Korea, Laos, Libya, Somalia, Syria, Turkmenistan, UAE, and Yemen.

Please see SIPRI’s methodologies page for more details on how they collect their data and create estimates.

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