Watch Live as NASA Launches Solar Sail to Test Sunlight-Propelled Space Travel

A new experimental mission by NASA is ready to set sail in orbit, using photons from the Sun to propel its way to higher altitudes.

The Advanced Composite Solar Sail System (ACS3) is scheduled for launch on Tuesday during a launch window that opens at 6 p.m. ET. The mission will lift off on board a Rocket Lab Electron rocket from the company’s Launch Complex 1 on the Mahia Peninsula of New Zealand. You can tune in to the launch through Rocket Lab’s live stream on its website or watch it through the feed below.

LIVE! RocketLab Electron 47 | Beginning Of The Swarm

NASA’s ACS3 is designed to test new materials and deployable structures for solar sail propulsion systems, including new composite booms that will be used to unfurl the solar sail once it reaches orbit. The composite booms are made from a polymer material; they’re lightweight while still being stiff and resistant to bending and warping when exposed to different temperatures. They work the same way as a sailboat’s boom, except they are designed to catch the propulsive power of sunlight rather than wind. Once unfurled, the solar sail will stretch across 30 feet (9 meters) per side.

Solar sails run on photons from the Sun, causing small bursts of momentum that propel the spacecraft farther away from the star. If a spacecraft is able to surpass the drag from Earth’s atmosphere, it could potentially reach very high altitudes.

Rocket Lab’s Electron will deploy the microwave-sized cubesat about 600 miles (966 kilometers) above Earth, which is roughly twice the altitude of the International Space Station. From there, the solar sail will be high enough to gain altitude and overcome atmospheric drag using the tiny force of sunlight on the sail, which is roughly equivalent to the weight of a paperclip resting on your palm, according to NASA.

NASA isn’t the only one being experimental on this mission. Rocket Lab is reusing an Electron booster for the first time during the upcoming launch. The company’s “Beginning Of The Swarm” mission will launch its Electron rocket with a booster that was already used for a previous launch.

On January 31, the “Four Of A Kind” mission saw the Electron rocket’s first stage fall back towards Earth with the help of a parachute before splashing down in the Pacific Ocean around 17 minutes after liftoff. The company recovered the rocket booster and is now reusing it for another flight. Rocket Lab has been experimenting with Electron’s reusability, hoping to inch itself closer to its main industry rival SpaceX. Electron’s upcoming launch will be a major test of the company’s ability to reuse the two-stage vehicle.

The Electron rocket will also be carrying NEONSAT-1, an Earth observation satellite for the Korea Advanced Institute of Science and Technology.

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