The Secretary of the United States Air Force confirmed on Monday that the country has deployed weapons in space to defend American forces. The Pentagon has not released specifications for the weapons, but known anti-satellite (ASAT) technology can help explain how such attacks in orbit generally work.
According to analysis by the Center for Strategic and International Studies (CSIS), a Washington-based think tank, there are four established categories of ASAT weapons already in use: kinetic physical weapons, non-kinetic physical weapons, electronic weapons and cyber weapons.
Speaking at the Air, Space and Cyber Conference, an annual event organized by the Air & Space Forces Association in National Harbor, Maryland, Secretary Troy Meink said the United States continued to ensure it remained ready to meet evolving threats wherever they existed. He said that was why the United States now possessed space-control weapons in orbit, capable of defending the joint force against hostile actions by adversaries.
Meink did not provide further details about the weapons and declined to elaborate when pressed. It is not known when the weapons were placed in orbit.
Kinetic physical weapons
Kinetic physical attacks are the best known and most visually dramatic, since they aim to physically destroy a satellite or its supporting infrastructure. Direct-ascent ASATs are medium- or long-range missiles fired from the ground, ships or aircraft toward orbit, destroying their targets through the kinetic energy of impact at orbital speeds of roughly 28,000 km/h rather than with explosives. One widely discussed problem with this method is the orbital debris it creates.
Co-orbital ASATs are interceptor satellites placed in orbit in advance that maneuver close to a target. They can act as "space mines" that detonate shrapnel at short range, or use robotic arms to grab, redirect or remove an adversary's satellite from orbit. A third kinetic option targets ground stations, using conventional military force such as missiles, artillery or sabotage of power and data networks against the antennas and command centers that control satellites.
Non-kinetic and electronic attacks
Non-kinetic physical weapons damage a target without any direct mechanical contact. High-power lasers, fired from the ground or mobile platforms, can permanently blind the optics of spy satellites or temporarily dazzle their sensors; at higher intensities, the heat they generate can melt solar panels and thermal structures. High-power microwave (HPM) weapons emit radio-frequency pulses that penetrate a satellite's antennas or seams, frying its internal circuitry and leaving it disabled and adrift. A nuclear electromagnetic pulse (EMP), produced by detonating a nuclear warhead at high altitude, releases a massive wave of radiation and electrons that can instantly burn out satellite electronics across a wide area of space.
Electronic attacks aim to neutralize a satellite's data transmission and reception through radio frequencies rather than destroying its hardware, and are typically temporary and reversible. Jamming occurs when a transmitter emits noise on the same frequency a satellite uses, effectively deafening the receiver, either by blocking the uplink sent from Earth to stop the spacecraft receiving commands, or by blocking the downlink sent to users on the ground, disrupting navigation networks such as GPS. Spoofing involves an attacker mimicking an authentic radio-frequency signal to deceive receivers, which can be used to feed false data into ground-based positioning systems or, in more serious cases, to send fake commands and seize control of a satellite.
Cyber attacks
Cyber attacks can be used to intercept and corrupt data or take control of systems. Unlike electronic attacks, which interfere with the radio-frequency transmission of data, cyber attacks target the data and systems themselves. Methods include interception and monitoring, infiltrating unencrypted channels to spy on the real-time flow of data and imagery transmitted by satellites; data corruption, silently altering the information a satellite processes to mislead operators or automated systems; and takeover of control, hacking into a satellite's command and control systems to seize operation of the spacecraft. If an attacker were to fire thrusters to crash a satellite or burn it up in the atmosphere, the damage would be irreversible.
Trump, the Space Force and rival powers
President Donald Trump has repeatedly praised the US Space Force, which he established in 2019 as part of the Air Force, as a historic step toward strengthening American defense capabilities amid an advancing arms race in which China and Russia have challenged US dominance in space.
As CNN reported in 2024, US intelligence has suggested Russia has also worked to develop a space-based nuclear weapon that would use a massive wave of energy known as an electromagnetic pulse to potentially disable a large share of commercial and government satellites, a claim Moscow has denied.
Such a weapon could have broad and devastating effects, for example by compromising the satellites the world relies on to forecast weather and respond to disasters, or by disrupting global navigation systems used for everything from banking and freight transport to ride-hailing apps and ambulance dispatch.
The report drew on information from Hanna Park of CNN.
