The Soviet Union launched Sputnik 1, the first artificial satellite, into space on October 4, 1957.

Space militarization refers to the deployment of weapons or military equipment in space, either in orbit around Earth or on other celestial bodies.

The Outer Space Treaty, adopted in 1967, prohibits the placement of nuclear weapons or other weapons of mass destruction in space.

The United States Space Force is responsible for defending U.S. interests in space, including protecting satellites and other space assets from attack.

As of 2023, the United States has the largest number of active satellites in orbit around Earth, with over 2,700 satellites.

Satellite reconnaissance refers to the use of satellites to collect intelligence on other countries, including military activities and infrastructure.

The Soviet Union launched Yuri Gagarin, the first human being, into space on April 12, 1961.

Anti-satellite weapons are designed to destroy or disable satellites or other space assets, typically using lasers or other directed energy weapons.

The Outer Space Treaty prohibits the testing of weapons in space, including nuclear weapons and other weapons of mass destruction.

Satellite communications refers to the use of satellites to transmit and receive data, voice, and video communications between military forces on the ground.

The Soviet Union launched Mir, the first space station, into orbit on February 19, 1986.

Arms control verification refers to the use of satellites to monitor compliance with arms control treaties, such as the Intermediate-Range Nuclear Forces (INF) Treaty.

As of 2023, the United States has the largest number of military satellites in orbit around Earth, with over 1,000 satellites.

Missile warning refers to the use of satellites to detect and track missile launches, providing early warning to military forces.

The Outer Space Treaty prohibits the use of force or the threat of force in space, including the use of weapons or military equipment.