The International Space Station (ISS) is a multinational marvel built and operated by the United States, Canada, Japan, Russia, and several European nations under the European Space Agency (ESA). Laid out in 1984 after President Reagan’s bold mandate, the station finally launched its first module in 1998, and today it orbits Earth as a 460‑ton laboratory the size of a football field. Below are the top 10 interesting facts that make the ISS a truly extraordinary outpost.
10. It’s Actually Falling
Even though we often picture space as a weightless void, gravity still pulls hard at the ISS. Orbiting roughly 200‑250 miles above Earth, the station feels about 90 % of Earth’s surface gravity – more than enough to pull it toward the planet.
The trick is that the ISS is falling, but it’s also moving forward at just the right speed. As it descends, Earth curves away beneath it, so the station continuously “falls around” the planet instead of crashing straight down. The Moon does the same thing, forever spiraling in its own orbit.
This perpetual free‑fall is why astronauts float inside the station. Because the craft and its crew are falling together at the same rate, there’s no net force pushing anyone toward the floor, creating the familiar weightless sensation.
Why This Is a Top 10 Interesting Fact
9. The Sun Rises Every 90 Minutes
The ISS whizzes around Earth once every 90 minutes, which means crews witness a sunrise and a sunset 16 times each day. Over a 342‑day stay, an astronaut would see 5,472 sunrises and just as many sunsets – a stark contrast to the 342 sunrises we experience on the ground.
Unlike a terrestrial dawn or dusk, the ISS crew never see the gradual color shift. Instead, they watch the terminator – the sharp line separating daylight from night on Earth – blaze across the planet below, marking each rapid transition.
8. The First Malaysian Astronaut On The ISS Had A Prayer Problem
Sheikh Muszaphar Shukor became Malaysia’s inaugural space traveler in October 2007, embarking on a nine‑day ISS mission. As a practicing Muslim, he needed to perform five daily prayers and observe Ramadan fasting, but the station’s 90‑minute day‑night cycle threw a wrench into the routine.
Prayer times are traditionally set by the Sun’s position, and the direction of Mecca (the Kaaba) must be faced. In orbit, the Sun rises and sets so fast that determining exact prayer moments becomes a nightmare, while the Kaaba’s bearing shifts every second, making it impossible to stay oriented.
Malaysia’s space agency, Angkasa, convened 150 clerics and scientists to devise a workable solution. They concluded Shukor could start each prayer facing the Kaaba and then ignore any subsequent movement, use any reasonable direction if the Kaaba’s location was uncertain, or even face Earth. They also relaxed the need for kneeling, full ablution, and fasting, allowing him to wipe with a damp towel and reduce prayers to three per day.
7. Earthly Politics
Although the ISS is a joint venture, ownership is split: the United States, Canada, Japan, Russia, and several European nations each control specific modules. The station itself is divided into a U.S. segment—shared among all non‑Russian partners—and a Russian segment used exclusively by Russia.
Geopolitical tensions have seeped into orbit. In 2014, after the U.S. imposed sanctions on Russia and cut ties with certain Russian agencies, the partnership strained. NASA, having retired the shuttle fleet, now relies on Russia’s Roscosmos to launch its astronauts. If Roscosmos were to withhold access, NASA would be in a difficult spot.
Indeed, after the fallout, Russian deputy prime minister Dmitry Rogozin humorously suggested the U.S. might need to fling astronauts to the station on trampolines – a reminder that earthly politics can have weighty (or weightless) ramifications in space.
6. There’s No Laundry
The ISS doesn’t boast a washing machine, and water is a premium commodity up there. While astronauts could theoretically pack enough clothing for a mission, the expense of sending cargo – $5,000 to $10,000 per pound – makes it impractical.
Dirty garments can’t simply be brought back to Earth; there’s no room on the return vehicle. Instead, used clothes are loaded into disposable cargo spacecraft, which burn up in the Pacific upon re‑entry, effectively incinerating the laundry.
Astronauts also don’t need fresh outfits daily. The station’s climate control keeps temperature and humidity steady, allowing crew members to wear the same gear for up to four days before swapping, conserving both mass and money.
5. Astronauts Exercise A Lot
Spaceflight inevitably robs the human body of bone density and muscle mass. On average, astronauts lose about two percent of mineral content in their limb bones each month. Over a typical six‑month stint, that can amount to a quarter of bone loss in certain areas.
To combat this, agencies mandate roughly two hours of daily exercise, using specially engineered equipment that works in microgravity. Despite the rigorous regimen, some loss still occurs, and researchers lack true control groups because essentially every astronaut follows the same routine.
The machines differ dramatically from gym gear on Earth, engineered to create resistance without gravity, ensuring crew members stay as fit as possible while floating miles above the planet.
4. The Toilet Astronauts Use Is Dependent On Their Nationality
In the early days of the ISS, crews shared everything—from food to bathrooms. That changed around 2003 when Russia began charging other partners for the use of its equipment, prompting a reciprocal billing system for American hardware.
The situation grew more tangled in 2005 when Russia started levying fees on NASA for transporting U.S. astronauts. In response, NASA barred Russian cosmonauts from using U.S. facilities, including toilets. Thus, the very bathroom a crew member uses can depend on their national affiliation.
3. Russia Might Kill The Program
While Russia can’t outright forbid other nations from the ISS, it can indirectly shut them out by pulling its own participation. Since NASA still depends on Roscosmos for crew transport, a Russian withdrawal could strand U.S. astronauts.
In 2014, Rogozin hinted that Russia might redirect funds away from its space program after 2020, even as the U.S. planned to keep sending crews until at least 2024. If Russia curtailed its efforts, access for U.S. astronauts could be severely limited.
NASA is already hedging its bets by partnering with commercial launch providers to ensure an independent pathway to the station—just in case the Russian “trampoline” joke becomes reality.
2. There Are Weapons On Board
The ISS carries one or two multipurpose firearms stored in a survival kit accessible to all crew members. Each weapon features three barrels capable of firing flares, rifle rounds, or shotgun shells, and includes fold‑out tools that double as shovels or machetes.
The exact purpose remains murky, but the weapons may trace back to a 1965 incident where returning cosmonauts allegedly encountered aggressive bears. Whether intended for wildlife, emergency repairs, or even a sci‑fi scenario involving extraterrestrials, the guns are a curious part of the station’s inventory.
1. Chinese Astronauts Cannot Visit The ISS
Since 2011, Chinese taikonauts have been barred from the ISS due to a U.S. congressional ban on any collaboration with China’s space program. The restriction stems from concerns that China’s activities may have undisclosed military applications, and U.S. lawmakers aim to prevent indirect support of those capabilities.
Experts argue the ban is counterproductive; China continues to advance its own space ambitions, having sent crews to orbit, deployed a lunar robot, and announced plans for its own modular station and a Mars rover. Excluding Chinese astronauts from the ISS does little to halt China’s broader extraterrestrial pursuits.