International Space Station (ISS)

The International Space Station (ISS) is the ultimate testament to what happens when "rocketry" meets "global cooperation." For Ad Astra, it represents our first permanent home in the stars.

The International Space Station: Humanity’s Orbital Outpost

Orbiting 400 kilometers (250 miles) above our heads is a shining beacon of human ingenuity: the International Space Station (ISS). It is the largest modular structure ever placed into orbit, a sprawling laboratory the size of a football field that zips across the sky at 28,000 kilometers per hour. For the visitors of Ad Astra, the ISS is more than just a satellite; it is a microgravity city where borders don't exist and science knows no limits.

A Masterpiece of Cooperation

The ISS is not the work of a single nation. It is a joint venture between five space agencies representing 15 countries: NASA (United States), Roscosmos (Russia), ESA (Europe), JAXA (Japan), and CSA (Canada).

Construction began in 1998 with the launch of the Russian Zarya module. Over the next decade, dozens of missions—primarily using the U.S. Space Shuttle—delivered additional laboratories, living quarters, and the massive solar arrays that provide the station’s power. Since November 2000, there has not been a single moment when a human being was not living aboard the station.

Life in Microgravity

Living on the ISS is a constant exercise in adaptation. Because the station is in a state of continuous freefall around the Earth, the astronauts experience microgravity. This means there is no "up" or "down."

To prevent their muscles and bones from wasting away in the absence of gravity, residents must exercise for at least two hours every day using specialized treadmills and resistance devices. They eat "space-stabilized" food, sleep in vertical sleeping bags tied to the walls, and even recycle 90% of their water (including sweat and urine) into fresh drinking water—a technology crucial for future Mars missions.

A Laboratory Like No Other

The primary purpose of the ISS is science. In the "National Lab" in orbit, researchers can conduct experiments that are impossible on Earth.

• Biological Research: Scientists study how plants grow without gravity and how the human body ages in space, providing vital data for long-duration spaceflight.

• Physics: The Alpha Magnetic Spectrometer on the station’s exterior searches for dark matter and antimatter, while the Cold Atom Lab creates states of matter colder than the vacuum of space.

• Earth Observation: From the Cupola—a seven-windowed observation module—astronauts have a god-like view of our planet, allowing them to track hurricane paths, glacial melt, and urban sprawl with unparalleled clarity.

The Logistics of Orbit

Maintaining a football-field-sized laboratory in the vacuum of space is a logistical marathon. The ISS is regularly visited by cargo craft like the SpaceX Cargo Dragon, Northrop Grumman Cygnus, and the Russian Progress. These "space trucks" bring food, fuel, and fresh scientific experiments. Since 2020, the SpaceX Crew Dragon and Boeing's Starliner have also restored the ability to launch astronauts from American soil, ushering in the era of commercial partnership.

The Sunset of a Legend

As of 2026, the ISS is nearing the end of its operational life. After nearly three decades of service, the station's primary modules are showing signs of age. Plans are currently underway to safely de-orbit the station in the early 2030s. However, the legacy of the ISS will live on through the Lunar Gateway—a smaller station planned to orbit the Moon—and a new generation of private, commercial space stations currently in development.

The ISS at a Glance for Ad Astra

• Speed: 7.66 km/s (17,100 mph)

• Orbits per Day: 15.5 (Astronauts see 16 sunrises and sunsets every 24 hours!)

• Pressurized Volume: Roughly equal to a Boeing 747.

• Crew Capacity: Usually 7, but can accommodate more during handovers.

• Key Feature: The Cupola—the "window to the world."