"Electromagnetic energy travels in waves and spans a broad spectrum from very long radio waves to very short gamma rays."
https://science.nasa.gov/ems/01_intro
"Most electromagnetic radiation from space is unable to reach the surface of the Earth. Radio frequencies, visible light and some ultraviolet light makes it to sea level."
https://imagine.gsfc.nasa.gov/science/toolbox/emspectrum1.html
"All spacecraft require electromagnetic compatibility (EMC) between their various equipment and subsystems, which demands a dedicated test campaign.
Antennas are the single most sensitive satellite element to interference, because they operate by deliberately turning electromagnetic fields into electric currents and vice versa."
https://www.esa.int/Enabling_Support/Space_Engineering_Technology/Electromagnetics_and_Space_Environment
"ectromagnetic energy There is abundant in space. Even though most of deep space (the vast stretches of empty area between planets, stars and moons) is cold and dark, space is flooded constantly by electromagnetic energy. All stars in the universe produce energy and send it out into space"
https://gabrielenoziglia.com/what-kind-of-energy-is-in-outer-space/
"In the 7th-6th century BCE, Thales of Miletus, one of the Seven Sages of Ancient Greece, taught that outer space is a type of fluid.
28 centuries later, some theoretical physicists believe that Thales might have been on to something."
https://www.ataire.io/space-as-a-superfluid/
"In the past, models considering spacetime as emerging, like a fluid, from more fundamental entities assumed and studied effects that imply changes in the propagation of photons, which would travel at different speeds depending on their energy. But there's more to it: "If we follow up the analogy with fluids it doesn't make sense to expect these types of changes only" explains Liberati. "If spacetime is a kind of fluid, then we must also take into account its viscosity and other dissipative effects, which had never been considered in detail".
Liberati and Maccione catalogued these effects and showed that viscosity tends to rapidly dissipate photons and other particles along their path, "And yet we can see photons travelling from astrophysical objects located millions of light years away!" he continues. "If spacetime is a fluid, then according to our calculations it must necessarily be a superfluid. This means that its viscosity value is extremely low, close to zero"."
https://phys.org/news/2014-04-liquid-spacetime-slippery-superfluid.html
Are we living ‘underwater’? Researchers believe the universe might be a ‘liquid superfluid’
https://www.dailymail.co.uk/sciencetech/article-2612949/Are-living-underwater-Researchers-believe-universe-liquid-superfluid.html