"It turns out that roughly 68% of the universe is dark energy."
https://science.nasa.gov/astrophysics/focus-areas/what-is-dark-energy
Solar Wind(Constant)
"The Sun releases a constant stream of particles and magnetic fields called the solar wind"
https://solarsystem.nasa.gov/resources/2288/the-solar-wind-across-our-solar-system/
"the solar wind – a continual stream of charged particles released from the Sun that fills the solar system."
https://www.nasa.gov/feature/goddard/2023/sun/nasa-missions-find-jetlets-could-power-the-solar-wind
Solar Wind Speed(Variable)
"the solar wind is gusty, ranging in speed from about 750,000 miles per hour (approximately 350 km/second) to 1.5 million miles per hour (700 km/second)."
https://www.nasa.gov/vision/universe/solarsystem/solar_wind_speed.html
"99.9 percent of the Universe is made up of plasma," says Dr. Dennis Gallagher, a plasma physicist at NASA's Marshall Space Flight Center. "Very little material in space is made of rock like the Earth."
https://science.nasa.gov/science-news/science-at-nasa/1999/ast07sep99_1/
"Plasma makes up nearly 100% of the interplanetary, interstellar and intergalactic medium."
https://www.plasma-universe.com/