>>11360453>Earth exists in a vacuumFalse. Space isn't a vacuum. There's no air in space, of course, and in /that/ sense it's a "vacuum" -- but other than that, nope. Until about 100 years ago space was thought to be empty. The words “vacuum” and “emptiness” were used interchangeably. But probes have found that space contains atoms, dust, ions, and electrons. Although the density of matter in space is very low, it's not zero. Therefore, space isn't a vacuum in the conventional sense of there being “nothing there at all”. For example, the Solar “wind” is known to be a flow of charged electric particles coming from the Sun and sweeping round the Earth, ultimately causing visible effects like the Northern (and Southern) Lights. The dust particles in space are thought to be 2 to 200 nanometers in size, and many of them are also electrically charged, along with the ions and electrons. This mixture of neutral and charged matter is called plasma, and it's suffused with electromagnetic fields. The “empty” spaces between planets or stars or galaxies are very different from what astronomers assumed in the earlier part of the 20th century.
https://youtu.be/5AUA7XS0TvA?t=2m10s 
