Solar Sail Interstellar Probe SolarSail Launches: First Commercial Mission Propelled by Light Pressure to the Edge of the Solar System
JAXA launches SolarSail solar sail interstellar probe, using solar light pressure as sole propulsion to fly toward the edge of the solar system at one-tenth the cost of traditional chemical propulsion
Solar Sail Interstellar Probe SolarSail Launches: First Commercial Mission Propelled by Light Pressure to the Edge of the Solar System
On November 6, 2029, JAXA successfully launched the SolarSail interstellar probe from the Tanegashima Space Center. This is humanity's first commercial deep space exploration mission powered solely by solar light pressure. SolarSail deploys a 2,500-square-meter ultra-thin reflective membrane that continuously receives the weak thrust of solar photons, reaching the Kuiper Belt at the edge of the solar system within 8 years.
SolarSail's advantage is that it requires no fuel. Traditional chemical propulsion deep space probes must carry large amounts of propellant, but SolarSail's entire动力 comes from sunlight. This gives it a payload ratio over 5 times that of conventional probes. JAXA estimates SolarSail's total mission cost at approximately $200 million — just one-tenth of an equivalent chemical propulsion mission.
"Solar sails are humanity's first step toward interstellar travel," said the JAXA SolarSail project lead. "Although light pressure is extremely weak — only about 9 micronewtons per square meter in Earth orbit — in the vacuum of space with no atmospheric drag, this force can accumulate to astonishing speeds."
SolarSail is expected to reach the Kuiper Belt at 50 astronomical units from the Sun by 2037, by which time its speed will reach 15 kilometers per second.
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